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Old 06-21-2011, 09:41 PM   #1
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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   #3
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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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