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Old 06-10-2021, 01:12 PM   #1
Hathos+
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Default 940 Turbo Wagon: Brake light fuse keeps popping

Are there any common points that short out the brake light circuit on wagons?

Just installed some fresh new housings, and all the wires are in their correct positions. All the other lights work too (Turn signal, reverse lights, fog lights, running lights)

It immediately pops the #4 fuse when I use the brake pedal.
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Old 06-10-2021, 01:48 PM   #2
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Check the tailgate hinges where the wires run. Over many flexings the wire insulation can wear through and ground out against the metal hinge casting.
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Old 06-10-2021, 01:52 PM   #3
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Check the tailgate hinges where the wires run. Over many flexings the wire insulation can wear through and ground out against the metal hinge casting.
Would this cause an issue even if there's no third brake light connected? (PO removed it, idk where it is.)
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Old 06-10-2021, 01:53 PM   #4
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Volvo engineers finally got it right with the 7-9. The harnesses do not go through the hinges.
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Old 06-10-2021, 02:34 PM   #5
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Ah yes that is what I thought. There's a rubber connector between the tail gate and car body just like on every other car right?

Could a bit of corrosion at the fuse box cause this issue?
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Old 06-10-2021, 03:43 PM   #6
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Originally Posted by 2manyturbos View Post
Volvo engineers finally got it right with the 7-9. The harnesses do not go through the hinges.
Whoops, morning me didn't read the title correctly.
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Old 06-10-2021, 04:26 PM   #7
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I found the dumb issue that I didn't notice because i was an idiot:

The absent third brake light spades were shorting out on each other which i didn't notice until now. Issue resolved!
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Old 06-10-2021, 06:11 PM   #8
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Cool. I suspected it was your third brake light. I should have everything you need if you want to put one back on there.
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