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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 04-24-2016, 02:25 PM   #1
steveff
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rb20 s13 no headlights or brake lights [help]

So I completed the swap in my s13 and went to drive it yesterday and the headlights and brake lights do not work.

What does work:
FRONT blinkers / flashers / fog lights
REAR running lights / blinkers / flashers / reverse lights.

NO headlights, high beams, or brake lights.
Switches are good because the relays click on. But the fuses aren't getting power. Hooked up a multimeter to the fuses and got nothing.

Every fuse/relay in the entire car is good. Checked em all.

So I'm thinking I missed a connector / ground or some sort of BS I'm overlooking. Cant find any plugs or connectors that mean anything to this issue that are unhooked. Don't see any loose or missing grounds. Went over everything with a fine tooth comb. Just seems weird because they're two separate things as far as I know, so what could I be missing that effects both of them??

Any ideas guys?
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Old 04-24-2016, 02:33 PM   #2
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Grab the FSM and start to trace back through the circuits and find out where you are and were you arnt getting power. Every single harness is blow apart in the FSM along with connectors.

My guess would be the column switch.
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Old 04-24-2016, 02:34 PM   #3
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R32 gtst FSM or an s13 FSM.

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Old 04-24-2016, 02:37 PM   #4
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S13 FSM, only thing that interfaces with your RB20 would be the lower transmission harness for the reverse lights.
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Old 04-24-2016, 03:30 PM   #5
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Are you sure you remembered to plug in your dash harness? the white plug on the passenger side above the ECU way up in the dash?

/my 2cents
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Old 04-24-2016, 03:30 PM   #6
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Yeah. Dash lights and interior lights all work.

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Old 04-24-2016, 05:12 PM   #7
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The red plug on the battery is power for the headlights. So if you relocated the battery or just forgot those plugs. That might be your issue. Post a picture in a minute.
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Old 04-24-2016, 05:13 PM   #8
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I did relocate the battery.... I don't remember seeing any red plug

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Old 04-24-2016, 05:17 PM   #9
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Did you get that picture?
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Old 04-24-2016, 05:18 PM   #10
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Yeah I got it.... I have no idea where that plug went.

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Old 04-24-2016, 05:19 PM   #11
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Do you have the wires that plug into it, if you do add 12v to it and you lights should work.
If you're not sure, if they are the correct wires, remove the headlight fuses and check continuity from the wires to the fuse.
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Old 04-24-2016, 07:16 PM   #12
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So black is alternator and green are headlights. Headlights are figured out now, just need that red plug or a terminal block.

What about brake lights now?

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Last edited by steveff; 04-25-2016 at 07:31 AM..
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Old 04-25-2016, 07:31 AM   #13
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Old 04-29-2016, 10:20 AM   #14
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Got it figured out. Headlights were that little red plug that I just hardwired. And the brake lights were a loose power wire going into the interior fuse box.

Weird how both happened at the same time though. Thought for sure it would be related.

Thanks again to whoever suggested that little plug, totally slipped my mind.

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