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Old 09-21-2010, 11:38 AM
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1936 pontiac coupe

i am working on a 1936 pontiac coupe with an lt1 and painless wiring harness. It has a 76' grand prix column. i am trying to get the dual filament bulbs in the rear. i am trying to make them work with blinker,stop,and park. and i am totally lost thx in advanced

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Old 09-21-2010, 12:02 PM
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The turn signals, hazard flashers and brake lights are controlled by the TS switch.
The tail/park lights are controlled by the headlight switch.
The bulb has two filaments with a common ground. The bright one for the TSs and brakes and the less bright one is for the tail/park lights.

See attached GM wiring diagram.

vicrod
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Old 09-21-2010, 04:09 PM
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As a MODERATOR ... I am going to move this thread to the ELECTRICAL area


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Old 09-22-2010, 07:39 AM
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ok so i fgured everything out i ended up relay isolating the brake wire and it worked perfect. now i am haing the issue with the leds. is there anyway to trick the car into thinking that the bulbs arent out??? when i hit the blinker they just stay on.
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Old 09-22-2010, 08:06 AM
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LEDs don't provide sufficient ampere load to make the flasher operate. Normal flashers depend on the load of at least 2 standard bulbs to flash.
Change to an electronic flasher. This type of flasher has internal time delay circuit and does not care about the load.

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Old 09-22-2010, 10:38 AM
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Electronic flashers are the way to go, but, you can also put a resistor across the wires that go to the led bulbs. 50watt 6ohm is a common choice, it's the same as having bulbs and you can use the existing thermal blinker.

With the electronic flashers you usually have to mount them under the dash, they don't just plug in
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Old 09-22-2010, 08:24 PM
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So when you say 6 ohm do u mean a normal 6 ohm resistor just to trick the car to think that there is a 50 watt bulb? Or is there such a thing as a 50watt 6ohm resistor??
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Old 09-22-2010, 10:53 PM
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They do sell a 50w resistor. eBay ? But yes, it has to be high watts. I think the resistor is drawing 25watts which is close to a set of bulbs. The 50w happens to be a rating. It's about as big as a AA battery with ceramic or metal around it if I recall.

A low watt resistor will pop. Take 12v divided by 6 = 2 amp. 2 amp x 12 v = 24watt. The actual resistance of the circuit is lower but i know they sell a 50w so someone had a reason for that.

an even cheaper fix..... Hide a bulb in the circuit. Lol, but the defeats the purpose I think?
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