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Problem with bulbs and turn signal

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Old Aug 3, 2023 | 08:34 PM
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Problem with bulbs and turn signal

So when I brake, the front turn signals illuminate. When I turn my right turn signal on, the hazards turn on. I heard it could be a wrong bulb cause a cross circuit. I did notice that the reverse Tailights amber bulbs, or where they should go, don’t push in and twist like the rest so I’m not sure what bulb goes there, any help would be great

(changed brake light switch)
(1985 trans am v8 5.0)
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Old Aug 4, 2023 | 09:20 AM
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Re: Problem with bulbs and turn signal

You definitely have a "cross circuit" type of problem somewhere. Since the right TS illuminates other bulbs, it's one of the ones on that side.

The bulbs in our cars were originally the old Stone Age 1156 & 1157 "bayonet" (twist-lock) style. The newer 31xx series is electrically identical, and totally interchangeable in every way except how it plugs in, but uses a FAR better connection method. Someone may have replaced that one socket on your car with one for that style instead of the Neanderthal one. In fact I've done that myself to more than one car: when I got tired of the caveman things screwing up, just cut the old sockets off - EVERY ONE in the whole car - and put in new-style ones. If so, that socket now needs a 3156 (1 filament) or 3157 (2 filament) bulb now. There are also some bulbs in these cars that are smaller; part # 194.
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Old Aug 4, 2023 | 01:02 PM
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Re: Problem with bulbs and turn signal

Originally Posted by sofakingdom
You definitely have a "cross circuit" type of problem somewhere. Since the right TS illuminates other bulbs, it's one of the ones on that side.

The bulbs in our cars were originally the old Stone Age 1156 & 1157 "bayonet" (twist-lock) style. The newer 31xx series is electrically identical, and totally interchangeable in every way except how it plugs in, but uses a FAR better connection method. Someone may have replaced that one socket on your car with one for that style instead of the Neanderthal one. In fact I've done that myself to more than one car: when I got tired of the caveman things screwing up, just cut the old sockets off - EVERY ONE in the whole car - and put in new-style ones. If so, that socket now needs a 3156 (1 filament) or 3157 (2 filament) bulb now. There are also some bulbs in these cars that are smaller; part # 194.

update: the headlights don’t work now. So horn doesn’t work, interior lights don’t work, headlights don’t work, door locks don’t work, checked fuses, none are popped. And a week ago my car died and wouldn’t crank. Someone in another thread said they had the same problem, took it to a shop, and it was the fusable links to the starter. Do you think that this could also be the same thing??
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Old Aug 4, 2023 | 01:06 PM
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Re: Problem with bulbs and turn signal

Originally Posted by sofakingdom
You definitely have a "cross circuit" type of problem somewhere. Since the right TS illuminates other bulbs, it's one of the ones on that side.

The bulbs in our cars were originally the old Stone Age 1156 & 1157 "bayonet" (twist-lock) style. The newer 31xx series is electrically identical, and totally interchangeable in every way except how it plugs in, but uses a FAR better connection method. Someone may have replaced that one socket on your car with one for that style instead of the Neanderthal one. In fact I've done that myself to more than one car: when I got tired of the caveman things screwing up, just cut the old sockets off - EVERY ONE in the whole car - and put in new-style ones. If so, that socket now needs a 3156 (1 filament) or 3157 (2 filament) bulb now. There are also some bulbs in these cars that are smaller; part # 194.


and as for the Tailights. Only the two reverse lights are different. They’re the same fit as the twist and turn, but these don’t have grooves for them to twist and turn. And I’m not sure if the square bulbs that your talking about would fit into these.
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Old Aug 4, 2023 | 01:13 PM
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Re: Problem with bulbs and turn signal

Yes fusible links at the starter can prevent about half the car, give or take, from getting power. Of course that's a complete other issue from the one you originally posted about.

It's too dark in your trunk right now for me to see whatever sockets you have. Without that I can't begin to GUESS (the only thing I can do) what they might be.
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