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Old 07-20-2018, 10:46 AM   #1
4oldcars
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Brake Lights

I rarely drive my 71 Jimmy (1k mile/yr), but when I do I have to check for brake lights. The brake light fuse (20A) blows. Not all the time. Sometimes not for months. 2-3 times a year I have to replace the fuse. Wiring appears ok and I've removed and disassembled the tail lights. Everything appears fine.
Any idea what may cause this?
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1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado

The ones I let go:
All Chevys; 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 pick up
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Old 07-20-2018, 12:07 PM   #2
VetteVet
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Re: Brake Lights

It's quite possible that the brake wire inside the steering column has chafed the insulation off in a spot that grounds when you turn the wheel and when you apply the brakes it blows the fuse.
If it was shorted down stream from the firewall, it could be one of the turn signal wires.
Yellow or dark green, but that would open up the possibility that just operating the turn signals or using the emergency flashers would also blow the fuse.

I would disconnect the half moon connector and do a continuity check on the white wire to the column housing while turning the steering wheel. If you get a reading then you have found the short.
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Old 07-22-2018, 10:16 AM   #3
4oldcars
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Re: Brake Lights

Thanx - I'll try that
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4oldcars

Driving:
1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado

The ones I let go:
All Chevys; 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 pick up
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Old 07-22-2018, 11:36 AM   #4
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Re: Brake Lights

Check the dome light circuit also. It works off the same fuse as the stop lights.
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Old 07-23-2018, 09:00 PM   #5
kwmech
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Re: Brake Lights

Do you have a trailer plug on the back?
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Old 07-24-2018, 11:42 AM   #6
4oldcars
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Re: Brake Lights

I do have a trailer plug and it too has a problem which I have been putting off repairing. Maybe I need to look into that.

I do have dome lights and they work fine. They were re-wired a while back.
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Driving:
1971 Jimmy w/68 Chev front clip, 1953 Bel Air 2 dr hdtp, 1996 Roadmaster wagon, 2000 Eldorado

The ones I let go:
All Chevys; 1931 2 dr sedan, 1935 pick up, 1938 2 dr sedan, 1962 SS 454, 1963 409 wagon, 1970 short bed, 1972 short bed, 1972 sub, 1976 short bed, 1986 pick up
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