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| help on wiring issue again... | |
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| Tweet Topic Started: Apr 26 2015, 01:46 PM (1,228 Views) | |
| fireflyin | Apr 26 2015, 01:46 PM Post #1 |
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when i apply my brakes ( with clearance lights off) the red/ yellow which is clearance lights has .50 volts i removed contact grease from the lights and still got a feed is it brake switch screwing up or broken ground somewhere?? cause my third brake light stays on when i read it .50 volts too third brake light without brakes been applied on 99 pontiac firefly automatic Edited by fireflyin, Apr 26 2015, 07:43 PM.
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| freegeo | Apr 26 2015, 11:38 PM Post #2 |
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Your explanation of the problem is kinda confusing. Could you explain it again. Are you saying the third brake light is on without the brake being applied? |
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| fireflyin | Apr 27 2015, 12:11 AM Post #3 |
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ok i'll explain it simpler turn the clearance lights on and my third brake light is dim (without applying brakes ) but when i apply the brakes it brightens up which it should cause its getting the full 12 volts now when i turn off clearance lights and hit the brakes i get 7 volts too the red and yellow wire which is corrected to rear brake light as clearance lights im not sure why im getting a back feed through red and yellow wire when the clearance lights are off |
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| Good bye | Apr 27 2015, 12:18 AM Post #4 |
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Remove the trim on the inside across the back. Remove both taillights, it sounds like resistance through a dual filament bulb feeding back. That is caused by either a bad ground or a dropped filament in one of the bulbs. I would look at both brake light bulbs first. Remove them one at a time and see if the problem disappears. |
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| fireflyin | Apr 27 2015, 01:48 PM Post #5 |
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there led brake lights i also did put resistors for signal light too cause there led too |
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| Good bye | Apr 27 2015, 04:54 PM Post #6 |
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You may need to install diodes to stop the back feed. |
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| fireflyin | Apr 27 2015, 05:38 PM Post #7 |
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what type tho like for amps n voltage? cause its only drawing 7 volts or 7.5 max |
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| Good bye | Apr 27 2015, 08:10 PM Post #8 |
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Before you start buying stuff why don't you try regular bulbs and see if your problems go away. |
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| fireflyin | Apr 28 2015, 12:11 AM Post #9 |
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problem went awhile so i gotta stop the back feed any clue what diode i would need? |
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| Good bye | Apr 28 2015, 01:00 AM Post #10 |
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If you are running led lights there is virtually no load, any small diodes from radio shack will work. I use heavy duty "Roadmaster" diodes for a lot of projects. They are available at any rv outlet or e-bay. |
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| fireflyin | Apr 28 2015, 01:11 PM Post #11 |
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what would be a good diode since its only low volts Intel i turn on clearance lights so roughly 7-13 volts not sure how much watts or amps it would be tho think a 2-6 amp diode would be good? |
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| Good bye | Apr 28 2015, 11:52 PM Post #12 |
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It is actually low amps so those should work fine. |
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| Stubby79 | Apr 29 2015, 09:27 AM Post #13 |
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I'd suggest testing with regular bulbs too... my LEDs haven't caused this problem. But, yes, I'd think its a feedback issue. maybe your resistors are hooked up wrong? like between the common of the bulb and ground, instead of just on the +12v wire of your brake lights. That would make the electricity go looking for an easier path to ground, in this case, your 3rd brake light... BTW, I use a cheapie LED-compatible flasher instead of the stock one, allowing me to indicate and whatnot without a resistor (wasting power). Edited by Stubby79, Apr 29 2015, 09:31 AM.
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| fireflyin | Apr 30 2015, 05:19 PM Post #14 |
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i tested with normal bulbs no backfeed i put diodes in just on brake wire and still back feed think i mite need some on the red / yellow wire next what do u think? |
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| Stubby79 | May 1 2015, 04:44 AM Post #15 |
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Not enough information, don't care to guess as to what you have or haven't done to be able to suggest anything. |
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7:53 PM Jul 10