lsx swap nissan 240sx wiring questions - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

laurentj23 · 01-02-2015, 06:57 AM

Hey all,

Im doing a lsx swap for my nissan 240sx. I purchased the wiring harness from wiring specialities. The project is almost completed. What stopped me is the wiring issues that I have. Here are the problems.

1. I bought a distributor block and route the positive battery to the block and the 2 outputs are for the starter and fuse box. So far my interior lights light up.
I grounded the negative battery cable to the chasis. Do i need to have another wire and ground it to the block? Where does the other end of the wire goes? the chasis?

2. When I tried to crank the first time, the fuel pump prime and the engine turned one time. Now, I tried to crank it again, the starter just click and the fuel pump did not prime. What is going on here? I check the the fuel pump relay and it did click. Do I have no power to the ecu?

PleSE help! thanks!
The battery, cables and starter are all new.

nick Ritter · 01-02-2015, 08:34 AM

take a look at this you should try and draw out a diagram of what circuit you got going on to get a bit more help !

laurentj23 · 01-02-2015, 08:56 AM

Quote:

Originally Posted by nick Ritter

take a look at this you should try and draw out a diagram of what circuit you got going on to get a bit more help !

nick Ritter · 01-02-2015, 09:03 AM

look at the diagram i showed you ^^

you need to label +/- in your drawing as well

you do need a ground on the engine block theres already a place on there where it should ground able i think its on the passenger side also towards the bottom if i remember correctly

laurentj23 · 01-02-2015, 12:30 PM

Quote:

Originally Posted by nick Ritter

look at the diagram i showed you ^^

you need to label +/- in your drawing as well

you do need a ground on the engine block theres already a place on there where it should ground able i think its on the passenger side also towards the bottom if i remember correctly

Ok awesome. Thats prolly what the issues are. What cable shld i use for ground? 8 gauge?

nick Ritter · 01-02-2015, 07:15 PM

let me know how it goes if not ill go look at my car and see where it is !

laurentj23 · 01-02-2015, 08:31 PM

Quote:

Originally Posted by nick Ritter

let me know how it goes if not ill go look at my car and see where it is !

I thought the ground need to be hooke on the ls head? Or are you talking about the chasis?

nick Ritter · 01-02-2015, 09:59 PM

theres a place from the factory on LS motors that is a ground ….. you can ground it out anywhere on the motor doesn't matter ….. is that a stand alone harness ? it should only require like 4 wires to run the motor if you have those wired in correctly your fine in that area …… look at the diagram i have above !…. remember a multimeter is your best friend when it comes to this stuff… there are plenty of diagrams on google images i don't wanna sound like a dick but do a quick search lol thats how i found out how to wire my car !

laurentj23 · 01-03-2015, 05:25 AM

Quote:

Originally Posted by nick Ritter

theres a place from the factory on LS motors that is a ground ….. you can ground it out anywhere on the motor doesn't matter ….. is that a stand alone harness ? it should only require like 4 wires to run the motor if you have those wired in correctly your fine in that area …… look at the diagram i have above !…. remember a multimeter is your best friend when it comes to this stuff… there are plenty of diagrams on google images i don't wanna sound like a dick but do a quick search lol thats how i found out how to wire my car !

The wire is from a wiring specialities. I know about doing a search and trust me ive done it. This is my first diy swap and wiring diagram is like french to me. By looking at the diagram, so im gonna have to put 3 wires on the starter? Ws instructions said just to run it with 2. One for the constant power and one for the positive battery cable.

nick Ritter · 01-03-2015, 05:28 AM

Quote:

Originally Posted by laurentj23

The wire is from a wiring specialities. I know about doing a search and trust me ive done it. This is my first diy swap and wiring diagram is like french to me. By looking at the diagram, so im gonna have to put 3 wires on the starter? Ws instructions said just to run it with 2. One for the constant power and one for the positive battery cable.

i have 3 wires on my starter …. see when i had my harness done (LSx4u.com) they gave me a complete wiring diagram sounds like yours may be set up different ????

laurentj23 · 01-03-2015, 08:51 AM

Quote:

Originally Posted by nick Ritter

i have 3 wires on my starter …. see when i had my harness done (LSx4u.com) they gave me a complete wiring diagram sounds like yours may be set up different ????

Heres the diagram

nick Ritter · 01-04-2015, 12:11 AM

yup thats the same way mine is setup ….. just looked at it ….

Lawrenceeeeee · 01-04-2015, 03:40 AM

When the car sits will it crank once again. Do you have the wire from the alt on the starter?

Lawrenceeeeee · 01-04-2015, 03:41 AM

Also, as far as grounds go, you have the grounds in your harness then put a ground for engine to chassis and another from chassis to ground. Be sure to sand chassis spots to bare metal before grounding there.

laurentj23 · 01-04-2015, 06:54 AM

This is how i ground it. The starter just click. Now it seems like theres no power , no click at all. Interior light is still on.

Drivers side head

Distributor block

Passenger side head.

Check the fuses everything is good.
Battery at 12.6 volts
Now the starter wont even click! Any help?

***S14DB*** · 01-04-2015, 03:05 PM

Where does your battery ground goto?

nick Ritter · 01-04-2015, 03:17 PM

Quote:

Originally Posted by S14DB

Where does your battery ground goto?

i think he said bottom of the tray …. mines grounded on the chassis …… but if he's hearing his starter "click" then he's getting power….. i think it might be a signal wire to the starter ??

laurentj23 · 01-04-2015, 03:49 PM

Quote:

Originally Posted by nick Ritter

i think he said bottom of the tray …. mines grounded on the chassis …… but if he's hearing his starter "click" then he's getting power….. i think it might be a signal wire to the starter ??

It's grounded on the battery tray. stock nissan s14 ground. OK so i found out why the starter is not clicking anymore. the fuse on the distribution block is blown. it's only 30 amp each which is not enough. Which one shld i get at auto zone ? I also found out that the chassis that i grounded with has paint in it. so stripped the paint off and now trying to fit the other issue.

***S14DB*** · 01-04-2015, 08:50 PM

Stock the battery goes to the ground by the fusebox on the fender then to the head. Looks like you have the head to fender already. I would just move the Battery connection to the fender.

I have a 50 or a 150amp fuse on mine.

nick Ritter · 01-04-2015, 09:21 PM

Quote:

Originally Posted by laurentj23

It's grounded on the battery tray. stock nissan s14 ground. OK so i found out why the starter is not clicking anymore. the fuse on the distribution block is blown. it's only 30 amp each which is not enough. Which one shld i get at auto zone ? I also found out that the chassis that i grounded with has paint in it. so stripped the paint off and now trying to fit the other issue.

up it to a 50amp

do you have a build thread ???? I'm going to be taking the ls2/t56 out of my GTU and putting it i my s14 !

laurentj23 · 01-05-2015, 04:40 AM

I tried to post a build thred but never get approved.
http://240atlanta.com/forums/showthr...q-build-thread
I ended up getting a 80 am each so total of 160 amp fuse.

For the heck of it, i tried check the vots on the ignition switch. One wire show reading while the key is off. 0 reading on all wires when i turn the switch to on. Of course i have to rig it with screw driver since i lost my key.

If i were to do it all over again. Just order the mounts that you needed. The rest like fuel line, ps line ect ect can be purschSe seperately for a lot cheaper.

laurentj23 · 01-05-2015, 04:42 AM

Quote:

Originally Posted by S14DB

Stock the battery goes to the ground by the fusebox on the fender then to the head. Looks like you have the head to fender already. I would just move the Battery connection to the fender.

I have a 50 or a 150amp fuse on mine.

Ill try that and see. For some reason i couldnt get the bolts off where the thing is grounded to the tray.

laurentj23 · 01-13-2015, 07:37 PM

http://youtu.be/KAD8VREC1hc

Lawrenceeeeee · 01-13-2015, 07:57 PM

I watched the video really quick. I saw you grounded neg bat to engine and you have harness ground on engine. Do you have a ground from engine to chassis. Have you checked for power at the key switch? There is one wire that feeds power. See if it is feeding power. If not it's something before then. If it is then find the wire that feeds starter signal off that switch. Switch it as if you were starting the car and see if it's getting power.

laurentj23 · 01-13-2015, 08:01 PM

Quote:

Originally Posted by Lawrenceeeeee

I watched the video really quick. I saw you grounded neg bat to engine and you have harness ground on engine. Do you have a ground from engine to chassis. Have you checked for power at the key switch? There is one wire that feeds power. See if it is feeding power. If not it's something before then. If it is then find the wire that feeds starter signal off that switch. Switch it as if you were starting the car and see if it's getting power.

I have 2 wires grounded from block to chassis excluding the negative cable. How do i check power to the switch? Which color cable?

Lawrenceeeeee · 01-13-2015, 08:05 PM

Do you have a voltometer? I believe it's black. Only one of those wires will have power without the key turned anywhere

laurentj23 · 01-13-2015, 08:08 PM

Quote:

Originally Posted by laurentj23

I have 2 wires grounded from block to chassis excluding the negative cable. How do i check power to the switch? Which color cable?

Yes. I've checked that. It's not 12 v though...it's like 3 v or something. But when I turn the switch to the on position, no power to any of the cable.

Lawrenceeeeee · 01-13-2015, 09:25 PM

Check voltage at battery.

laurentj23 · 01-19-2015, 03:58 PM

https://www.youtube.com/watch?v=whws...r#action=share

new update! so close!

nick Ritter · 01-19-2015, 10:13 PM

you figured out what was wrong ?

01-02-2015, 06:57 AM	#1
laurentj23 Zilvia Junkie Join Date: Dec 2011 Location: Chattanooga,TN Age: 37 Posts: 422 Trader Rating: (1) Feedback Score: 1 reviews	lsx swap nissan 240sx wiring questions Hey all, Im doing a lsx swap for my nissan 240sx. I purchased the wiring harness from wiring specialities. The project is almost completed. What stopped me is the wiring issues that I have. Here are the problems. 1. I bought a distributor block and route the positive battery to the block and the 2 outputs are for the starter and fuse box. So far my interior lights light up. I grounded the negative battery cable to the chasis. Do i need to have another wire and ground it to the block? Where does the other end of the wire goes? the chasis? 2. When I tried to crank the first time, the fuel pump prime and the engine turned one time. Now, I tried to crank it again, the starter just click and the fuel pump did not prime. What is going on here? I check the the fuel pump relay and it did click. Do I have no power to the ecu? PleSE help! thanks! The battery, cables and starter are all new. __________________ 'Born Ready!',LJ

01-04-2015, 06:54 AM	#15
laurentj23 Zilvia Junkie Join Date: Dec 2011 Location: Chattanooga,TN Age: 37 Posts: 422 Trader Rating: (1) Feedback Score: 1 reviews	This is how i ground it. The starter just click. Now it seems like theres no power , no click at all. Interior light is still on. Drivers side head Distributor block Passenger side head. Check the fuses everything is good. Battery at 12.6 volts Now the starter wont even click! Any help? __________________ 'Born Ready!',LJ

01-04-2015, 03:05 PM	#16
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Where does your battery ground goto? __________________ Comments should be taken as Opinions not as Statements of Fact

01-04-2015, 08:50 PM	#19
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Stock the battery goes to the ground by the fusebox on the fender then to the head. Looks like you have the head to fender already. I would just move the Battery connection to the fender. I have a 50 or a 150amp fuse on mine. __________________ Comments should be taken as Opinions not as Statements of Fact

01-05-2015, 04:40 AM	#21
laurentj23 Zilvia Junkie Join Date: Dec 2011 Location: Chattanooga,TN Age: 37 Posts: 422 Trader Rating: (1) Feedback Score: 1 reviews	I tried to post a build thred but never get approved. http://240atlanta.com/forums/showthr...q-build-thread I ended up getting a 80 am each so total of 160 amp fuse. For the heck of it, i tried check the vots on the ignition switch. One wire show reading while the key is off. 0 reading on all wires when i turn the switch to on. Of course i have to rig it with screw driver since i lost my key. If i were to do it all over again. Just order the mounts that you needed. The rest like fuel line, ps line ect ect can be purschSe seperately for a lot cheaper. __________________ 'Born Ready!',LJ

01-02-2015, 09:03 AM	#4
nick Ritter Leaky Injector Join Date: Dec 2014 Location: St. Paul Age: 28 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	look at the diagram i showed you ^^ you need to label +/- in your drawing as well you do need a ground on the engine block theres already a place on there where it should ground able i think its on the passenger side also towards the bottom if i remember correctly

01-02-2015, 07:15 PM	#6
nick Ritter Leaky Injector Join Date: Dec 2014 Location: St. Paul Age: 28 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	let me know how it goes if not ill go look at my car and see where it is !

01-02-2015, 09:59 PM	#8
nick Ritter Leaky Injector Join Date: Dec 2014 Location: St. Paul Age: 28 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	theres a place from the factory on LS motors that is a ground ….. you can ground it out anywhere on the motor doesn't matter ….. is that a stand alone harness ? it should only require like 4 wires to run the motor if you have those wired in correctly your fine in that area …… look at the diagram i have above !…. remember a multimeter is your best friend when it comes to this stuff… there are plenty of diagrams on google images i don't wanna sound like a dick but do a quick search lol thats how i found out how to wire my car !

01-04-2015, 12:11 AM	#12
nick Ritter Leaky Injector Join Date: Dec 2014 Location: St. Paul Age: 28 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	yup thats the same way mine is setup ….. just looked at it ….

01-04-2015, 03:40 AM	#13
Lawrenceeeeee Leaky Injector Join Date: Dec 2012 Location: Las Vegas Age: 27 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	When the car sits will it crank once again. Do you have the wire from the alt on the starter?

01-04-2015, 03:41 AM	#14
Lawrenceeeeee Leaky Injector Join Date: Dec 2012 Location: Las Vegas Age: 27 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	Also, as far as grounds go, you have the grounds in your harness then put a ground for engine to chassis and another from chassis to ground. Be sure to sand chassis spots to bare metal before grounding there.

01-13-2015, 07:37 PM	#23
laurentj23 Zilvia Junkie Join Date: Dec 2011 Location: Chattanooga,TN Age: 37 Posts: 422 Trader Rating: (1) Feedback Score: 1 reviews	http://youtu.be/KAD8VREC1hc __________________ 'Born Ready!',LJ

01-13-2015, 07:57 PM	#24
Lawrenceeeeee Leaky Injector Join Date: Dec 2012 Location: Las Vegas Age: 27 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	I watched the video really quick. I saw you grounded neg bat to engine and you have harness ground on engine. Do you have a ground from engine to chassis. Have you checked for power at the key switch? There is one wire that feeds power. See if it is feeding power. If not it's something before then. If it is then find the wire that feeds starter signal off that switch. Switch it as if you were starting the car and see if it's getting power.

01-13-2015, 08:05 PM	#26
Lawrenceeeeee Leaky Injector Join Date: Dec 2012 Location: Las Vegas Age: 27 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	Do you have a voltometer? I believe it's black. Only one of those wires will have power without the key turned anywhere

01-13-2015, 09:25 PM	#28
Lawrenceeeeee Leaky Injector Join Date: Dec 2012 Location: Las Vegas Age: 27 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	Check voltage at battery.

01-19-2015, 03:58 PM	#29
laurentj23 Zilvia Junkie Join Date: Dec 2011 Location: Chattanooga,TN Age: 37 Posts: 422 Trader Rating: (1) Feedback Score: 1 reviews	https://www.youtube.com/watch?v=whws...r#action=share new update! so close! __________________ 'Born Ready!',LJ

01-19-2015, 10:13 PM	#30
nick Ritter Leaky Injector Join Date: Dec 2014 Location: St. Paul Age: 28 Posts: 101 Trader Rating: (0) Feedback Score: 0 reviews	you figured out what was wrong ?

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