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Turn signal and gauge lights flash together - take a guess.
Posted by: 66vairman ()
Date: February 15, 2018 04:38PM

Whenever the left turn signal was on the dash gauge lights would blink on and off.

If the running lights were on then the left front turn signal would be illuminated.

I'll post what caused it later, a problem I've never seen before --- Take a guess!

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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: SoloCP ()
Date: February 15, 2018 04:43PM

Sounds like a grounding problem.

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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: VairKing ()
Date: February 15, 2018 04:49PM


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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: oldqmguy ()
Date: February 15, 2018 05:05PM

Bad Ground!! eye popping smiley

Been there, done that! drinking smiley

Dale cool smiley

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Avon, Indiana
WB9SFF
1967 4-Door Monza PG!

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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: 66vairman ()
Date: February 15, 2018 05:56PM

Yes it was a bad ground, but not were you would expect it!!

After buzzing out the circuits and sockets I FINALLY found the problem - the ground on the bulb socket was open to the filaments!! A first for me and I've been doing this stuff for many decades.

Bulb looked good - but it tested bad and a new bulb worked fine.

Acted just like the turn signal housing, or dash ground was bad.

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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: MattNall ()
Date: February 15, 2018 05:58PM

Yup one burnt filament won't do that, but 2 will.





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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: 66vairman ()
Date: February 15, 2018 11:10PM

MattNall Wrote:
-------------------------------------------------------
> Yup one burnt filament won't do that, but 2 will.

Both filaments were good and tied together at the ground, but the ground common was not connected to the bulb socket ground case. So if power went to either filament it would return via the other one through the instrument cluster bulbs. Bizarre ground loop, but electricity will follow a path to ground not matter how convoluted.

I could get a resistance reading though the filament contacts, but both filaments were open to the bulb ground case.

A buddy said the old bulbs had a ground wire from the glass envelop to the bulb metal case and it probably came loose. In the old days you could see where the wire was soldered at the metal edge near the glass envelope.

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Re: Turn signal and gauge lights flash together - take a guess.
Posted by: Wagon Master ()
Date: February 16, 2018 04:52AM

66vairman Wrote:
-------------------------------------------------------
> A buddy said the old bulbs had a ground wire from
> the glass envelop to the bulb metal case and it
> probably came loose. In the old days you could see
> where the wire was soldered at the metal edge near
> the glass envelope.

Good info. I'd seen that and always thought it was just the other, ground side of the filament(s).

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