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Trouble switching from incandescent to LED taillights
#1406607 Sun Apr 18 2021 11:14 PM
Joined: Apr 2021
Posts: 6
B
'Bolter
My 1952 3100 truck was long ago converted to 12v, and all the lights worked well (incandescents). But to get authentic looking reproductions and bright light I chose LED taillights from LMC motors. The old taillights were just trailer lights with three leads: running, brake, and turn signal, powering one single filament bulb and one double. They were activated by a toggle under the dash. Ugly but worked!

The LED taillights are three leads: running light, brake & turn, and ground. I changed them out (including the LED compatible flasher) and connected the wires according to the diagram (brake and turn sharing a lead), but now I have running lights and brake lights, but the turn signals both blink at once. Taillight manufacturer told me the toggle wouldn't work and I replaced it with the steering column clamp-on unit from LMC with the same results.

Incidentally the new turn signal switch has an emergency flasher which works fine, as do the front turn signals (incandescent).

Any advice for the amateur electrician?

Re: Trouble switching from incandescent to LED taillights
Bellflower #1406672 Mon Apr 19 2021 03:47 PM
Joined: Dec 2002
Posts: 4,257
Moderator - The Electrical Bay and Rocky Mountain Bolters
Make sure your grounds are good and clean. Maybe add a ground to each light housing.
Make sure that you didn't cross wire the turn signals.


Another quality post.


Real Trucks Rattle

HELP! The Paranoids are after me!
Re: Trouble switching from incandescent to LED taillights
Bellflower #1406692 Mon Apr 19 2021 06:52 PM
Joined: Mar 2019
Posts: 117
T
'Bolter
I assume you replaced the flasher with an electronic one that is designed for use with LED's. LED's typically do not provide enough electrical load for a traditional flasher to work properly. Your 4 way works because both front incandescent bulbs together provide enough load.


Rusty
Re: Trouble switching from incandescent to LED taillights
Bellflower #1406706 Mon Apr 19 2021 08:13 PM
Joined: Apr 2021
Posts: 6
B
'Bolter
Thanks, but yes I changed to the LED flasher

Re: Trouble switching from incandescent to LED taillights
Bellflower #1406740 Tue Apr 20 2021 12:46 AM
Joined: May 2005
Posts: 8,433
B
Sir Searchalot
If you provide the part number and vendor for the LED's and for the turn signal switch, I will help you wire it up. I don't know about issues involving mixing LED and incandescent. I don't know how many flashers or what kind are necessary with mixed types. I can help you wire it according to the instructions. I believe you don't have a ground problem if hazard works and front turn signals work. So this points to LCD/turn signal switch miswire or flasher issue. If the front lights flash OK and the rear LED lights flash OK during hazard mode, it then seems that flasher is OK and that points to miswire.

So if I can study the parts you bought and instructions, I can verify wiring with you if you wish.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


Re: Trouble switching from incandescent to LED taillights
Bellflower #1406806 Tue Apr 20 2021 12:51 PM
Joined: Feb 2016
Posts: 546
7
'Bolter
I agree with bartamos, sounds like left and right rears are shorted together or wired together. I built my turn signal system using the three wire original turn signal switch. I am running single 1157 bulbs in the rear and single 1156 in the front. I added two DPDT relays under the dash. The turn switch activates a relay, one for each side, the original flasher can handles the job. All new wire to the rear and all original wire in the front.


1957 Chevrolet 5700 LCF 283 SM420 single speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto
Re: Trouble switching from incandescent to LED taillights
Bellflower #1406871 Tue Apr 20 2021 08:07 PM
Joined: May 2005
Posts: 8,433
B
Sir Searchalot
I don't think there is a three wire turn signal switch in this world.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


Re: Trouble switching from incandescent to LED taillights
bartamos #1406877 Tue Apr 20 2021 08:41 PM
Joined: Sep 2001
Posts: 31,334
Bubba
Originally Posted by bartamos
I don't think there is a three wire turn signal switch in this world.

Are you referring to the 6v flasher/relay? - there are a few here [amazon.com]


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Trouble switching from incandescent to LED taillights
Bellflower #1406893 Tue Apr 20 2021 10:22 PM
Joined: May 2005
Posts: 8,433
B
Sir Searchalot
Tim, to whom is this question directed?


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
I used to think beer was bad for me, so I gave up thinking.
Sometimes no nonsense makes sense, in a sense.
You can't teach a new dog old tricks.
Honk if you're Amish


Re: Trouble switching from incandescent to LED taillights
Bellflower #1406899 Tue Apr 20 2021 10:48 PM
Joined: Sep 2001
Posts: 31,334
Bubba
To whomever might be interested in a flasher with three leads.

Here is one that I have used with LED bulbs. [amazon.com]


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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