WTF is wrong with my car (95 with s13 blacktop)

[ATLnismofreak]

hey guys, so im still trying to get my sr to run...ill charge up the battery, start the car, then watch the voltage drop like panties at the prom! i just tried replacing the alternator, but its still not holding power (im not sure if the new one is good, but im gonna have the original tested tomorrow and maybe rebuilt)...other than the alternator what could cause this rediculous drop in voltage

ps i have a miata battery but im pretty sure this isnt the problem

Also, what does the bigger plug that runs along the side of the passenger side door go to? There are two plugs that come up from over there, i found where one goes but not the other one? (ill get a picture of the plug tomorrow when the suns out)

[ATLnismofreak]

Update...replaced fl75a and fl45a.....no change lol

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[Edwin562]

have you tried a different batt?

[ATLnismofreak]

I can start the car, it just doesn't stay on...once running shouldn't the alternator be taking the load

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[Bentleyness]

I can start the car, it just doesn't stay on...once running shouldn't the alternator be taking the load

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yea it should but if alt is bad ill take its juice from the battery till it dies. ground on the alt goes to chassis and the + goes to the + battery wire which is part of the chassis harness, trace the ground and the + wire coming from the alt.

[ATLnismofreak]

I noticed a ground but I think it was running into the lower harness? Imma get under tomorrow and see what's up

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[Bentleyness]

The lower harness consists of wires for trans/starter/alt.
And yes the ground should be going into the lower harness. Then from there to the passenger strut towers. I would remove ur lower harness and make sure everything is OK and inspect each wire. Yea it takes time and then tape them back up and make it look pretty.Its common issue I seen with the lower harness shorting out and causing issues one like wat ur having.. good luck I would also do the ground wire kit. Ground ur starter/alt/block. I notices faster start ups, less power drain( ac kick in and lights don't dim) ,

[ATLnismofreak]

Word...yeah I noticed its a bit slow to start up, and I'm having to give it gas to get it running...ill check that ground in the am...if possible could you pm me where all the grounds are/should be so I can do a double check

(This is my first sr, did the swap solo and tend to not see the lil things)

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[Bentleyness]

Just ground the ground anywhere. I have a ka-t so idk wats ground on Sr. I helped cuz ka and srare almost the same to work on.

[itsjustdaphne]

"like panties at the prom" .. that made me lol

[ATLnismofreak]

Thx for the help...time to get to it...

And yeah I put that panties thing in to humor people into helping lol

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[JDMRIDDAZ]

the 2 pin plug on alt needs to be pluged in...
if alt doesnt get an ign signal it does turn on the charge...
wht=12 v
thin wht/red needs to go to alt charge signal...

[jedi03]

check ur fuses...the 100amp one fried on a vehicle borrowed an had same issue...