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09-09-2019, 07:11 AM | #1 |
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Let me ask another way
Hi Guys
I posted a question regarding an issue with my LED tail lights not working properly (head lights on no brake lights) and received no response. Seeking to understand, how does regular/stock filament tail lights work on a 39? Does the lower filament work the turn signals and stop lights and the upper filament work when the headlights are turned on? Or visa versa? Or something else?
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09-09-2019, 07:27 AM | #2 |
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Re: Let me ask another way
The regular original bulb if you look close has a filament made of thin wire, that is taillight, the one that is the thicker wire will be the brightest, and for brake light
My friend has a 36 packard, it came with every type of bulb, all were dim, only getting 4.5 volts to taillight. Traced it to rusted nuts on the ammeter --- |
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09-09-2019, 08:44 AM | #3 |
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Re: Let me ask another way
My guess is the LED tail light bulbs are for 6V negative ground. I bought some last year for my 32 pickup and they would work with negative ground and not positive. There was a lengthy thread going and it had some info on why they won't work both ways
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09-09-2019, 08:49 AM | #4 |
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Re: Let me ask another way
You might try switching the polarity to the rear bulbs. LEDs only work when wired in one polarity direction. That is the nature of a diode.
Al Hook |
09-09-2019, 08:57 AM | #5 |
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Re: Let me ask another way
Thx the LEDs are pos grd. They state that on the box they came in.
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09-09-2019, 09:07 AM | #6 |
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Re: Let me ask another way
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On an incandescent bulb there is a difference in the filaments which ends up making one brighter than the other (the brighter one being the brake). But if they were connect backward it would still work, it would just have the brake light being dimmer than the tail light. It is just a brightness issue, not a function issue. The bulb filaments do have to provide enough load for a heat type blinker canister to work. But with LEDs you are going to have to have a compatible canister and/or a load device in the light unit. |
09-09-2019, 09:21 AM | #7 |
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Re: Let me ask another way
Your right again. I had to put a resistor in-line then to grd to make led blink.
These are plug and play leds. I had no brake lights (with no headlights and no & no brake lights w lights on) before cutting out the bucket and canister of leds Now everything works except when headlights on I have no brake lights
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09-09-2019, 10:27 AM | #8 |
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Re: Let me ask another way
I would find the brake light wire at the tail light bucket and verify that it is hot when brakes are actuated, both with headlights on/off. Then verify that the brake light hot wire is connected to the brake light section of the LED light. As jSeery said above, if the tail light wire is connected to the brake light section of the LED cluster, you won't see when the less bright portion (tail light) is activated by the brake light switch.
Last edited by 40cpe; 09-09-2019 at 12:04 PM. Reason: clarity |
09-09-2019, 12:09 PM | #9 | |
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Re: Let me ask another way
Quote:
Adileo, was mainly interested in if the wiring is basically original with the turn-signal wiring added on. |
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09-09-2019, 12:18 PM | #10 |
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Re: Let me ask another way
Jerry that’s correct wiring original add turn signals
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09-09-2019, 12:56 PM | #11 |
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Re: Let me ask another way
Some turn signals get the brake light wire to the turn signal switch, when in turn mode the brake light wire is disconnected in the switch to that bulb so the signal will flash--- many times a xtra wire is run to right side, original wire for brake lights would be used for left side
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09-09-2019, 02:02 PM | #12 |
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Re: Let me ask another way
Make good ground wires for the rear light housings.
Bruce
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09-09-2019, 02:33 PM | #13 |
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Re: Let me ask another way
That’s already been cared for thanks
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09-09-2019, 05:20 PM | #14 |
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Re: Let me ask another way
All fixed thank you for all your advise. The wires were reversed from LEDs.
Simple stupid....
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09-09-2019, 07:29 PM | #15 |
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Re: Let me ask another way
But you figured it out and fixed it! Good job.
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09-09-2019, 07:54 PM | #16 |
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Re: Let me ask another way
Good job Andy, had my tools ready.
Tom |
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