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Yet another Brake light thread
#973307 Sat Sep 21 2013 10:42 AM
Joined: Apr 2013
Posts: 63
G
gmtjr Offline OP
Wrench Fetcher
'53 3100 with:
12v system, 12v bulbs
signal-stat 900
new brake light switch from classic-parts
confirmed clean, unabridged wire from fuse block to brake light switch to tail lights.

these Tail lights


i've been scouring the forums for weeks now and just today got all the lights operating as they should minus the brake lights (headlights low and hi, parking lights,tail-lights, front and rear turn signals, all four corners and hazard lights)

BUT no matter how i wire the brake lights, i can't get them to operate. i replaced the (20amp) fuses a couple times just to cross that off as an issue. i pulled the multimeter and i'm not getting any voltage at any stage in the line (wire end coming from the light switch in the cab, anywhere along the fuse, nor at the "hot" wire end going to the brake light switch.

i even tried removing the bullet connectors at the brake light switch and connecting the wires directly to eachother just to eliminate the brake light switch as the issue. still nothing

i DO have continuity through the fuse and from the top of the fuse to the "hot" wire end going to the brake light switch. i'm thoroughly confused and have printed copies of both the factory chevy wiring and the factory signal-stat 900 wiring


ALSO: if i tie the single brake light wire at the rear TO the tails with the turn signal wires, i can't operate the turn signals individually because the voltage from the turn signal jumps the brake wire and sends voltage to the other rear turn signal, so am i supposed to send TWO brake light wires out of the brake light switch and give a brake light wire to each tail light just to isolate the voltage? the electrical diagrams don't show two wires, but that seems like the only way to isolate the tail lights from eachother. (the rear lights are labeled to have tail lights on one wire, and brakes/turns on the other)

Last edited by gmtjr; Sat Sep 21 2013 10:49 AM.
Re: Yet another Brake light thread
gmtjr #973314 Sat Sep 21 2013 11:45 AM
Joined: Jan 2010
Posts: 4,510
D
Shop Shark
The brake light function is handled thru the signal switch.

Wire the left rear brake light to the corresponding wire called for on the signal switch diagram.
Wire the right rear brake light to the corresponding wire called for on the signal switch diagram.

Tail lights are seperate circuit and get wired to the headlamp switch.

On your signal switch there should be one wire labeled to stop switch.

Hope that helps

Re: Yet another Brake light thread
gmtjr #973321 Sat Sep 21 2013 12:39 PM
Joined: Apr 2013
Posts: 63
G
gmtjr Offline OP
Wrench Fetcher
just traced down the signal-stat wires, here's the wires on the signal-stat and what they are wired to:

blue wire- flahser
yellow wire- flasher
red wire- right front turn signal
grey wire- left rear turn signal
green wire- left front turn signal
black wire- right rear turn signal

the blue and yellow wires go to the flasher, and the third prong on the flasher goes to the light switch on the dash.

the brake light switch has two wires, one leads to the rear to connect to the brake lights, and the other comes from the fuse panel on the firewall under the hood, then goes to the light switch on the dash.



is there supposed to be a seventh wire to go to the brake light switch? and if so, i would connect it to the "hot" wire on the brake light switch? i think that's the missing piece.

Last edited by gmtjr; Sat Sep 21 2013 12:43 PM.
Re: Yet another Brake light thread
gmtjr #973323 Sat Sep 21 2013 12:48 PM
Joined: Jan 2010
Posts: 4,510
D
Shop Shark
Is there a 7th wire. Black/gray?


Re: Yet another Brake light thread
gmtjr #973326 Sat Sep 21 2013 12:56 PM
Joined: Apr 2013
Posts: 63
G
gmtjr Offline OP
Wrench Fetcher
FOUND IT! i started rolling back the tight and clean electrical tape at the flasher and about 9 inches up the line, i found the dead-ended black/grey wire.. the electrical tape was so tight i figured it had been taped up by the signal-stat manufacturer, and was hesitant to undo it.. i think this is it, i'll post up the results

Last edited by gmtjr; Sat Sep 21 2013 12:56 PM.
Re: Yet another Brake light thread
gmtjr #973338 Sat Sep 21 2013 02:10 PM
Joined: Apr 2013
Posts: 63
G
gmtjr Offline OP
Wrench Fetcher
ok, i tied the black/grey wire into the wire going from the brake light switch to the rear lights.

at the rear of the truck, i tied the single brake light wire to two other wires, and tied those two into the mix with the turn signal wires in each light casing.

i still can't get the brake lights to light up when i activate the brake light switch, and now i can't get the turn signals to act individually because they're basically jumpered by the brake light wires. same as before

Re: Yet another Brake light thread
gmtjr #973340 Sat Sep 21 2013 02:14 PM
Joined: Jan 2010
Posts: 4,510
D
Shop Shark
The black/grey will go the the stop switch on the firewall

The other wires should go the way You described above
Originally Posted by gmtjr
just traced down the signal-stat wires, here's the wires on the signal-stat and what they are wired to:

blue wire- flahser
yellow wire- flasher
red wire- right front turn signal
grey wire- left rear turn signal
green wire- left front turn signal
black wire- right rear turn signal

Black/grey to stop switch

Re: Yet another Brake light thread
gmtjr #973346 Sat Sep 21 2013 02:24 PM
Joined: Jan 2010
Posts: 4,510
D
Shop Shark
Here is an simple drawing I made when I was wiring my 7 wire switch
...click...

It shows how the wires should run

I had problems because I had no labels for the wires I was using
Used Cletus tech tip to figure it out.

The drawing is not specific to your switch but you can see how the wires route.

I used a 3 prong flasher.

Re: Yet another Brake light thread
gmtjr #973347 Sat Sep 21 2013 02:25 PM
Joined: Oct 2010
Posts: 1,257
L
Shop Shark
Congrats.

> SignalStat 900 diagram

- Lonnie


- Lonnie
My '54 3104
Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post.
lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt.

OLD STUFF ... houses, furniture, cars, wine ... I love it all
Re: Yet another Brake light thread
DADS50 #973349 Sat Sep 21 2013 02:37 PM
Joined: Apr 2013
Posts: 63
G
gmtjr Offline OP
Wrench Fetcher
Originally Posted by DADS50
Here is an simple drawing I made when I was wiring my 7 wire switch
...click...

It shows how the wires should run

I had problems because I had no labels for the wires I was using
Used Cletus tech tip to figure it out.

The drawing is not specific to your switch but you can see how the wires route.

I used a 3 prong flasher.


that drawging looks mostly like what i have now, except that at the brake light switch, there's two wires attaching, but one goes straight to the lights themselves with a wire connecting it to the flasher, then the other goes to the fuse block, then to the light switch on the dash.

pic showing the brake light wire being split to go to both brake lights (thus causing the turns to jumper to eachother)

pic showing the brake light switch wiring.. wire coming up from the brake light and then connecting to the wire headed to the rear of the truck

pic showing the wiring of the fuse block .. the red wire coming in through the firewall is attached to the black/grey wire, i stuck the wire inline with the fuse block after i tried connecting it to the OTHER wire at the brake light switch. neither way works

Last edited by gmtjr; Sat Sep 21 2013 02:37 PM.
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