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No brake lights- what am I missing here?
#1412556 Thu Jun 03 2021 09:49 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Here's the facts:

1. 1957 Panel Truck
2. New brake light switch is mounted in truck
3. New wire harness
4. Fuses are in fuse block for parking lights, turn signals, and brakes
5. Testing with one of those square trailer lights

I see no voltages on the brake light switch wires nor the wires that go to the back lights. I had the ignition turned to on, but did not have it running. Pretty sure these lights should work even when the truck is not running, right?

Wish I knew why this truck fights me so hard.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: No brake lights- what am I missing here?
pan3lman #1412562 Thu Jun 03 2021 11:35 PM
Joined: Mar 2010
Posts: 558
B
Curmudgeon
Would you please post your wiring diagram AND any modifications you have made?

Have you checked for a blown fuse?

Re: No brake lights- what am I missing here?
pan3lman #1412563 Thu Jun 03 2021 11:41 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Thanks for the response. No mods made, brand new fuses. The harness is a Speedway Motors 22 circuit harness. I will find a link to a diagram, but there are 2 wires that go to the switch (brown and white), and then 3 wires to the back for turn signal, stop, and running lights (yellow for left, green for right, brown for running.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: No brake lights- what am I missing here?
pan3lman #1412564 Thu Jun 03 2021 11:43 PM
Joined: Jan 2020
Posts: 473
P
'Bolter
Link:

https://www.websearch.com/url?sa=t&source=web&rct=j&url=https://static.speedwaymotors.com/pdf/91064022.pdf&ved=2ahUKEwil3rP70fzwAhXXSzABHcSUAucQFjAAegQIBBAC&usg=AOvVaw0Mbw-Oj8L5zZO7mSZxwot2


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: No brake lights- what am I missing here?
pan3lman #1412569 Fri Jun 04 2021 12:01 AM
Joined: Jul 2000
Posts: 1,273
G
Insomniac


Gord
----
1954 1/2 ton 235 4 speed
Re: No brake lights- what am I missing here?
Gord&Fran #1412574 Fri Jun 04 2021 12:23 AM
Joined: Jan 2020
Posts: 473
P
'Bolter
Originally Posted by Gord&Fran
Thank you, apologies.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: No brake lights- what am I missing here?
pan3lman #1412588 Fri Jun 04 2021 01:59 AM
Joined: Mar 2010
Posts: 558
B
Curmudgeon
This is a universal wiring kit so it's not a custom fit to your 57 which I suspect your already know.
Are you using the 1969-74 GM column as noted in the instructions?
If not then it looks like you have additional wiring to do.
If you have added the wiring, would you please provide a diagram of this wiring?

Note in the instruction:
This kit was designed to function with a factory GM style
switch and column plug. It plugs into the 3-7/8” plug found
on GM columns from 1969-1974. It is found on a majority
of after market columns including Speedway’s Tilt Columns
such as p/n 910-32972
If you are using a later 1975 and on column we have
included a connector to convert over to the required style.
The columns use the same pin out locations making the
swap easy; please follow the wiring table below to install the
adapter plug on a column.

Re: No brake lights- what am I missing here?
pan3lman #1412609 Fri Jun 04 2021 11:30 AM
Joined: Jan 2020
Posts: 473
P
'Bolter
Thanks for taking the time to review that. No, I am using the stock column. For the brake light connection, I did not think that anything on the steering column would either need to be connected or involved. I figured it would come into play for the turn signals, but not the brakes.

I guess I will have to research this further.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: No brake lights- what am I missing here?
pan3lman #1412622 Fri Jun 04 2021 01:30 PM
Joined: Jul 2000
Posts: 1,273
G
Insomniac
Think about it. The brake light, turn signal and hazard (4 way flashers) all use the same bulb. What controls everything is the turn signal switch.


Gord
----
1954 1/2 ton 235 4 speed
Re: No brake lights- what am I missing here?
pan3lman #1412631 Fri Jun 04 2021 02:35 PM
Joined: Mar 2010
Posts: 558
B
Curmudgeon
Do you have a copy of the original 57 Chevy Panel Truck wiring diagram?
Do you have an original or add-on turn signal switch on your steering column?

For the rear lights, the brightest or high element is used for brakes and turn signals and that's why the wiring goes to the turn signal switch.
"IF" your brake and turn signals are a separate light, I would convert to having both in the same light because it is a standard configuration.

For your turn signal connector plug (only applies to a 6 wire turn signal assembly):

Connector G ---- to wire coming from your horn switch (one side of switch is ground and when switch is made, puts a ground on this wire).
Connector H ---- to your turn signal switch wire, left direction (light blue?)
Connector J ---- to your turn signal switch wire, right direction (dark blue?)
Connector K ---- not available in 1957
Connector L ---- to your turn signal switch center or common wire, not ground (yellow?)
Connector M ---- to your turn signal switch brake/rear wire, right direction (purple?)
Connector N ---- to your turn signal switch brake/rear wire, left direction (pink?)
Connector P ---- to your turn signal switch brake feed wire (white?)

I included above what I think is the color code for 1957 turn signal wiring but you need to verify everything to make sure. I am human and easily make mistakes.

Last edited by buoymaker; Fri Jun 04 2021 02:37 PM.
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