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(continued)

A good Tech Tip
WINTERIZING YOUR TRUCK
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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?

Joined: Dec 2002
Posts: 4,431
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!
Joined: Mar 2019
Posts: 119
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
Joined: Apr 2021
Posts: 6
B
'Bolter
Thanks, but yes I changed to the LED flasher

Joined: May 2005
Posts: 9,100
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.





Joined: Feb 2016
Posts: 776
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, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
Joined: May 2005
Posts: 9,100
B
Sir Searchalot
I don't think there is a three wire turn signal switch in this world.





Joined: Sep 2001
Posts: 31,685
Bubba - Curmudgeon
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]
Joined: May 2005
Posts: 9,100
B
Sir Searchalot
Tim, to whom is this question directed?





Joined: Sep 2001
Posts: 31,685
Bubba - Curmudgeon
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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