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Old 08-14-2016, 01:48 AM   #1
PardoR
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Default Tailgate wiring party: defroster shorted with lights and more!

I'm very dissapointed....

Today I was changing the tailgate wiring... First in the driver side and I bypassed the hinge and everything (brake lights and plate lights) was OK. Is necessary to say, when I bought the car , the plate light and defroster were not working. Just the 3rd light worked and the car had a alternative or poor wiring just to keep working the 3rd brake light. with the tailgate wiring changed the plate light and 3rd brake light worked perfect. But when I pressed the defroster button all became insane....

I change the wires without problems but after press the defroster button, I pressed the brake pedal and the 3rd brake light don't light on, the plate lights illuminates and the defroster button keeps on.

Without pressing defroster button and pressing the brake pedal, the 3rd light dims, the plate lights works and the defroster button lights on (weird).

I found a ceramic red fuse blown near the abs pump under the hood , so I replace it. But when re created the situation (pressing the brake pedal, hitting the defroster, etc...) And the fuse blown again. So I replaced it and removed the defroster relay. I pressed the brake pedal and the defroster button lighted on again but the fuse did not blown, the 3rd brake light did not light on and the plate light illuminates.... I was enjoying all this crap today , even cannot changed the passenger side tailgate wiring...

Please really need your inputs and be merciful, I am not electric specialist but I can do my best effort.
Greetings! Saludos desde el culo del mundo
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Old 08-14-2016, 06:58 AM   #2
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Probably something melted while it was all shorted out, so you still have a short somewhere, probably before tailgate. Continuity tester is your only friend there...
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Old 08-14-2016, 06:37 PM   #3
PardoR
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The ground black wire inside the hinge was cutted. I repaired it and problem solved!
That ground is key for the defroster. Without it the car goes crazy!
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Old 08-18-2016, 09:26 AM   #4
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The ground black wire inside the hinge was cutted. I repaired it and problem solved!
That ground is key for the defroster. Without it the car goes crazy!
congrats! it's logical, the defroster pulls lots of Amps so it needs a good ground. Same for the blower motor, the starter motor, anything that uses big electrical power.

I had very similar issues with my V70 (2001), some of the wires near the tailgate hinge were worn to reveal bare copper and this caused all kinds of electrical issues like not being able to unlock the tailgate, wiper motor issues, taillight issues.
To get good access to the wires i even had to partially dismantle the headliner.
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Old 12-04-2016, 01:13 PM   #5
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Just to keep solved all my threads..... And in order to help others...
The ground hinge was useless. And simply replace the ground cable and all the electric nightmares were solved.
Thank to all!
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Old 12-04-2016, 01:16 PM   #6
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Piggybacking on this thread, when I replaced the tailgate harnesses in my 245 it fixed everything but the defroster. The switch lights up but the back window doesn't defrost at all.
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