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View Full Version : '91 S13 weird electrical issue - any ideas?


PW180SX
02-10-2014, 07:25 AM
Hey everyone,

Did a bunch of research, can't exactly pinpoint my problem. Electrical is not my strong suit...so any input would be appreciated.

Here's my problem. I've had this issue with two motors now (RB & KA), but when I start the car everything runs just fine. But other than the clock on my cluster and the aftermarket gauges, no other electronics work. Windows don't work, RPM doesn't work, CD player doesn't work, headlights/blinkers don't work (well, headlights work, but the motors don't operate). Nothing works UNTIL I rev up the motor to about 3-4K, then everything fires up and works fine.

Even with the key to the ON position, then only thing that does anything is the fuel pump. No warning lights, CD player, windows, power seat belts etc.

Any ideas as to what this could be? I figured it's a ground issue with the chassis harness or even a battery/alternator problem. I went through every ground, sanded down the contact area etc. Battery has good connection (it's low on juice, but I tried swapping it with a known good battery and still has the same issue) and the alternator has to be good cause the motor I have now (KA) came out of my friends car he daily drove up to the point of removal.

The only thing I've done to the chassis harness is fix the fender harness issue and tucked it up. Maybe something is grounding out?

I'll also point out, the battery has been relocated to the trunk. But I did this two years ago with my original KA and it worked perfectly fine.

Any ideas would be appreciated, thanks!

foreverdeath
02-10-2014, 07:38 AM
So nothin works but engine related stuff and the gauges you put in with the engine running? Do you have power a the fuse box ( each fuse) Check that first. that's a pretty wild problem idfk start there it may come down to looking over the fender harness tuck.

PW180SX
02-10-2014, 07:44 AM
Yeah exactly. It's pretty crazy lol. I'll check power to the fuse box today and update with what I find

S14.5patches
02-12-2014, 08:49 PM
Check the harness under the wheel well and see if it has been eaten through has been known to cause problems.

jorge1190
02-12-2014, 08:51 PM
Also check all your dual filament bulbs like brake lights. They can cause very weird problems if the filaments burn together.

Fuego
02-12-2014, 09:40 PM
75a alt fuse.

PW180SX
02-13-2014, 05:30 AM
Thanks for the ideas guys, I'll check on them today!

PW180SX
02-13-2014, 07:56 PM
75a alt fuse.

You were correct. Fixed all my problems, thanks man!

Fuego
02-13-2014, 08:26 PM
You were correct. Fixed all my problems, thanks man!

No worries, I had the exact same issue a couple months ago. Glad you got it fixed!

TwoForDeh
02-21-2014, 04:14 PM
i was reading through this and was literally about to say check the 75a fuse. when those little bastards go, everything fucks up.

PW180SX
02-23-2014, 10:58 AM
^
Yeah, Glad I know now! I grabbed a bunch of them at the junkyard lol lol