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Old 09-09-2019, 07:11 AM   #1
adileo
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Default 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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Old 09-09-2019, 07:27 AM   #2
Kurt in NJ
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Default 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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Old 09-09-2019, 08:44 AM   #3
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Default 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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Old 09-09-2019, 08:49 AM   #4
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Default 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.

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Old 09-09-2019, 08:57 AM   #5
adileo
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Default 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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Old 09-09-2019, 09:07 AM   #6
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Default Re: Let me ask another way

I'm not familiar with the LEDs that are setup for Pos ground. Goes the socket or the harness part you removed have anything to do with the LEDs functioning in a Pos ground system?

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.
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Old 09-09-2019, 09:21 AM   #7
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Default 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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Old 09-09-2019, 10:27 AM   #8
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Default 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
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Old 09-09-2019, 12:09 PM   #9
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Default Re: Let me ask another way

Quote:
Originally Posted by 40cpe View Post
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.
Good advice.

Adileo, was mainly interested in if the wiring is basically original with the turn-signal wiring added on.
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Old 09-09-2019, 12:18 PM   #10
adileo
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Default Re: Let me ask another way

Jerry that’s correct wiring original add turn signals
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Old 09-09-2019, 12:56 PM   #11
Kurt in NJ
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Default 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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Old 09-09-2019, 02:02 PM   #12
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Default Re: Let me ask another way

Make good ground wires for the rear light housings.


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Old 09-09-2019, 02:33 PM   #13
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Originally Posted by cmbrucew View Post
Make good ground wires for the rear light housings.


Bruce
Thatís already been cared for thanks
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Old 09-09-2019, 05:20 PM   #14
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Default 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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Old 09-09-2019, 07:29 PM   #15
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But you figured it out and fixed it! Good job.
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Old 09-09-2019, 07:54 PM   #16
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Good job Andy, had my tools ready.

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