91 Wiring issues Brake pedal acts as starter - Jeep Wrangler Forum

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Old 06-21-2011, 09:41 PM
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91 Wiring issues Brake pedal acts as starter

Hi I recently purchased a project 91 wrangler 4.0 I6.
The previous owner pulled out the original underdash wiring harness due to the gauges not working (he claimed) so he bought a used harness off ebay plus used guages off ebay and got rid of the old stuff. I began plugging the new harness in and have noticed that there are a few extra plugs, plus plugs that come from my jeep that wont plug into the harness. Cant seem to find a 91 wiring harnes on ebay for the life of me. Its always 87-90 or 92-95. Which would work for my jeep? I am assuming he bought the wrong one.

On to the good part. I have hooked up enough of the harness to make a chance at starting but when i went to start it..... I turned the key nothing happened. Pushed the brake and the motor started cranking!! With the key in the off position by the way.

If i turn the emergency flashers on they stay off until i turn the key to the on position and I can also here the relays clicking but nothing else.

As soon as I push the brake in and engage the small switch mounted at the top back of the brake lever assembly the motor starts cranking. But does not start. I am assuming it doesent actually start due to the Fuel pump not being engaged due to the ignition issue.

What is the small switch on my brake assembly...does the jeep not start until the brake is pushed in and my ignition switch is stuck?

Sorry if that came out confusing and long

Help please

Thanks
Jeremy
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Old 06-21-2011, 11:49 PM   #2
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So it sounds like your brake switch is wired to the starter. Your harness is def messed. You could bypass the switch and try routing it. If you can score a wiring diagram you could trace the wire and see where it ends up. That might shed some light. I'm guessing it's the same harness for 87 to 95 with a few additions.

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Old 06-22-2011, 12:09 AM
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Thanks jeeprich
I did finally find a wiring diagram tonight that I don't have to pay for so I should be able to know what colors I'm looking for now. Whether I can trace it back through all the other wires is another thing I'm going to give it a shot tomorow.

When the jeep is working properly does the brake pedal have to be depressed in order for the jeep to start as a safety precaution.

Thanks again
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Old 06-22-2011, 08:36 AM   #4
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I have a `91 YJ 4.0L I6 Manual Transmission and no the brake does not need to be depressed but the clutch does. I believe the small switch on the upper portion of the brake pedal is the brake light switch. If yours is an auto, I can't help you.
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Old 06-22-2011, 10:01 AM   #5
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jdub, this sounds like a nightmare and i wish you all the best with this. the only thing in can add here is that mine doesn't require me to press neither the clutch nor the brake to start.

good luck...........
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Old 06-22-2011, 12:24 PM   #6
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jeeps are hell when it comes to wiring, basically connect the computer and stuff for to make the truck run, and run all new wires for everything else. I have a carb in my truck, soo i rewired the entire truck and have most of it on toggle switchs, ignition toggle switch and i have no computer or anything
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Old 06-23-2011, 06:35 PM   #7
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Mine also doesn't require clutch or brake to start. 1990 2.5 with 5 speed.
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Old 02-07-2012, 09:41 PM   #8
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I am having the same issue, just wondering if you ever figured this out. Any help is appreciated.
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Old 02-08-2012, 09:40 PM   #9
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Somebody switched the two wires in the plug behind the fuse box. It was obvious after I looked at the wires going into the plug. The tan and white wire was pulled much tighter than any other wires. The yellow wire for the starter circuit has much more slack than the rest. I switched them back after replacing the broken connector and it fired right up like normal. I am curious to see if we bought from the same guy on eBay. Pm me if you get a chance. Thanks.
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Old 08-20-2013, 01:12 PM   #10
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Im having a similar issue with my ignition minus the brake pedal thing. Any chance you can post pics of you wiring under the dash into the ignition switch and where they go after that. I pulled my alarm out after it went haywire but now cant figure out which wires to connexct
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Old 10-03-2015, 05:46 PM   #11
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I have this same issue. I will give the back story so that everyone understands what has gone before.
I bought an old 1993 jeep YJ for my son's first car. It had been cosmetically restored with aftermarket diamond plate body panels (to cover rust ). The thing ran good and was dependable for his shirt trips back and forth to school. I found the frame was rotted away and breaking apart so I scabed some pages on the steering box, then a front shackle. At that point I started looking for a frame and found a complete 1992 YJ frame, engine, transmision and front and rear axels and all the electrical system. We completely disassemble the thing, sand blasted the frame and used good frame paint on it. Rebuilt the axels (bearings and seals) new brakes and rotors/drums, brake cylinders, lines. New shocks and steering stabilizer. New plugs, wires, distributor cap and rotor.
We moved the 93 body, to the 92 chasis, we kept the 93 computer, dash and lighting harnesses but used the engine and firewall harness from the 92.
The engine will crank as soon as the brake pedal is depressed even with the ignition key in the locked position. The fuel pump isn't working regardless of the key position. I poured gas into the air intake (yea I am old) and the enging starts and runs perfect until the gas is used up.
I plan on swapping the computer tomorrow and see if that fixes the issue but I am open to any words of wisdom.
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Old 10-03-2015, 08:13 PM   #12
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what engine/engines? trans?
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Old 10-04-2015, 08:18 AM   #13
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It's a 2.5 liter, manual 5 speed. Once I get this all sorted out I will be attempting to get rid of an entire Jeep chasis except the frame is broken in half.
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Old 10-04-2015, 07:32 PM   #14
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In case anyone is interested. It would seem that the 93 jeep tub w/dash (the wire colors all match the 97 and newer diagrams ) was not compatible with the 92 wireing harness. Even though all the plugs matched up there is an apparent difference in the way the steering column is wired. When the brake pedal is depressed it engages the starter relay, also when the hazard lights are switched on, that engages the starter relay toggling on and off in time with the hazard relay.
Looking at a Haynes manual the only thing those two functions have in common is they are fed by the same fuse and both operate the rear tail lights.
At any rate I installed the newer harness that went to the newer tub and everything functions as it should.
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Old 10-04-2015, 08:02 PM   #15
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Quote:
Originally Posted by Oldsarge View Post
when the hazard lights are switched on, that engages the starter relay toggling on and off in time with the hazard relay.
LOL that's funny right there.

Glad you got it figured out

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