97 electrical problem - Defender Source
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  #1  
Old January 1st, 2010, 12:05 PM
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97 electrical problem

Hi.
My 90 is at the shop. It is having a strange electrical problem. The multi-function ecu fried up so we put a new one in and it didn't fix the problem. Almost melted the new one.
Here is what is happening.
The brake lights stay on all the time. When I put the key in and hit the brakes the dash lights come on and the fuel pump turn on. Also the dome lights turn on and off with the brake pedal. When we remove the main chassis ground it turns off the brake lights. It is a sw and the rear defogger switch isn't coming one either is the rear wiper.
Has this ever happened to anyone here. I searched but couldn't find anything like this.

Checked all the fuses and doesn't seem to be a relay. Also check behind the fuse box and wires and all seem fine.
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  #2  
Old January 6th, 2010, 02:45 PM
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Damn Lucas

Still a mystery.....Anyone have any advice?

BUMP

---------- Post added January 6th, 2010 at 07:47 PM ----------

Also, when I turn off the truck when it is running the truck stays on, even with the key out.....as soon as I remove my foot from the brakes it shuts off.


The truck runs fine BTW>
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  #3  
Old January 6th, 2010, 02:56 PM
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What does frank think? If it were me, I would pull fuses until it stopped doing what it was doing. I would check the ignition switch. Then I would check things like the ground straps. These are all shots in the dark though. Did you trace the wires to the brake light switch? How about a short in the clump of wires behind the passenger side rear speaker?
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Old January 6th, 2010, 03:01 PM
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Frank is still working on it. Hasn't come up with anything yet.....He knows his stuff so I'm hoping he will. Just trying to help him out. Pulled all fuses and relays. He has checked most of the wires and everything looks ok. Even pulled the ECU.

I will post the outcome as soon as it is figured out. When he pulls the main chassis ground fuse under the hood the lights do go out.
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Old January 6th, 2010, 03:04 PM
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The chassis ground indicates a short somewhere to me, but I am not an expert. Tell him to look behind the passenger side speaker in the back to see if that bundle is shorted. I suppose it could also be a short inside the rear door where the wires to the light/defroster go. Given the issues you described, that would be my best guess, but like I said, I am no expert on wiring issues.
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Old January 6th, 2010, 03:07 PM
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Will pass it along Ron....Thanks.
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Old January 6th, 2010, 03:12 PM
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I assume he has unplugged the rear defroster?
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Old January 6th, 2010, 03:19 PM
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I think he has. He seems to think something is feeding back somewhere.
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Old January 6th, 2010, 03:32 PM
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Some of those systems are all tail wiring harness related.
Dash lights will get back-feed from other lights, etc. brake lights feeding power to the fuel pump or something.

Its next to impossible to diagnose things via email, but if I had it I would start by going to the RH front fender area, by the heater, and unplugging the tail wiring harnesses. Then try the systems in the rest of the truck. If the truck acts normally with the tail harness unplugged then at least you have a place to start.
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  #10  
Old January 6th, 2010, 03:33 PM
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Thank guys!!! I will relay the message...

---------- Post added January 6th, 2010 at 08:41 PM ----------

He already did that didn't help.

Thanks very much for the advice though.
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Old January 6th, 2010, 03:48 PM
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Already did what? Unplug the whole tail harness at the bulkhead or in the back?
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Old January 6th, 2010, 03:51 PM
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Quote:
Originally Posted by ECR View Post
Some of those systems are all tail wiring harness related.
Dash lights will get back-feed from other lights, etc. brake lights feeding power to the fuel pump or something.

Its next to impossible to diagnose things via email, but if I had it I would start by going to the RH front fender area, by the heater, and unplugging the tail wiring harnesses. Then try the systems in the rest of the truck. If the truck acts normally with the tail harness unplugged then at least you have a place to start.
I have a question. Does the Multi-Function ECU control any of this.(The problems I describe) The reason I ask is at first I thought the ECU caused the problems but we put a new one in and it started to overheat. We have since left it out to try to find the problem. That is why I wanted to know if having this ECU not hooked up will make it harder to diagnosis the problem.

Thanks for your time.

---------- Post added January 6th, 2010 at 08:52 PM ----------

He unplugged the tail harness at the bulkhead.
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Old January 6th, 2010, 06:40 PM
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Frank figured it out. He is the man!!

All this ended up being caused by a wire in the rear harness that was frayed. Inside the chassis where the rear crossmember and fuel tank is. It was inside the rails so it was a bitch to find.Thanks for all the help everyone!
He even reused my pigtails!

Everyone in PA should use this guy for service!
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  #14  
Old January 7th, 2010, 04:29 AM
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Yay for the rover whisperer.

BTW this is Frank's shop

www.roverrepairs.com
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