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Brake lights stay on
#1347735 Mon Feb 24 2020 02:35 PM
Joined: Sep 2013
Posts: 1,008
M
Shop Shark
This is one of those "it never ends" threads. I've been driving the '51 in my tag line for a few years without any major "gotchas. It does what a old driver truck should do. With the occasional minor hickup. Well this past weekend after a 30 mile trip to town to buy feed, I backed into the barn, unloaded a few sacks of sweet feed and noticed the brake lights were on. Dang, brake-light switch is bad or the pedal is hanging wrong. Nope, pedal fine and after a quick unhooking of the 3 wires to the switch, lights still on.

What I discovered with the wife watching is that with key on, (brake lights still own) the turn signals do blink. So, that's good.

I can turn the lights off when the key's off by pulling out the 4-way flasher activation tab on the turn signal switch. That's good as well since I don't have to pull the battery cables when the truck's setting.

After giving the wiring a quick look, nothing obvious jumps out as wrong so the plan is in the next few days I'll take the turn signal switch apart and see if I can spot the problem.

Yep, once again, it never ends. Will report what I find and the ultimate solution in the hope that it'll help others.

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Brake lights stay on
moparguy #1347746 Mon Feb 24 2020 04:17 PM
Joined: Dec 2002
Posts: 3,576
Moderator - The Electrical Bay and Rocky Mountain Bolters
Do the brake lights do anything when you press the brake pedal?


Another quality post.


Real Trucks Rattle

HELP! The Paranoids are after me!
Re: Brake lights stay on
moparguy #1347749 Mon Feb 24 2020 04:23 PM
Joined: Apr 2008
Posts: 779
F
Shop Shark
Did you eliminate the brake light switch by disconnecting it?


Ed
Re: Brake lights stay on
moparguy #1347750 Mon Feb 24 2020 04:26 PM
Joined: Sep 2013
Posts: 1,008
M
Shop Shark
Rusty, No Sir.

Ed, Yes Sir.


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Brake lights stay on
moparguy #1347755 Mon Feb 24 2020 04:47 PM
Joined: Jan 2010
Posts: 4,510
D
Shop Shark
Do you have a 7 wire turn signal switch?

Also you said you disconnected 3 wires to the brake switch. Should only be two wires


Sounds like you might have a bad turn signal switch

Re: Brake lights stay on
moparguy #1347937 Wed Feb 26 2020 01:23 AM
Joined: Sep 2013
Posts: 1,008
M
Shop Shark
Tackled the turn signal/brake light issue today. After spending a couple hours checking most everything but the flasher and not finding a problem I opened up the turn-signal switch. The attached image shows the wire that had popped loose and was creating all the aforementioned problems. The solution was to solder in a piece of twisted wire (with insulation stripped off) into the hole of the contact and then soldering the broken wire to the new connection. Finished it off with a heat shrink sleeve.

Glad to report, all's good now.

To correct my previous comments and response to questions: On my first look at possible causes for the brake lights staying on I mistakenly (for some impossible to defend reason) mistook the dimmer switch for the brake light switch. I disconnected the three wires to it and of course it had no effect on the brake lights. When I thought through it all while on a walk a day of so later (and with a Homer Simpson forehead slap) I realized what I'd done. When I got back to the shop, I did then unplug one of the brake light switch wires and the brake lights did go off.

RonR

Attached Files
InkedTurnsignal swich_LI.jpg (35.97 KB, 80 downloads)
Last edited by moparguy; Mon Mar 02 2020 03:57 PM.

1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Brake lights stay on
moparguy #1347943 Wed Feb 26 2020 02:06 AM
Joined: Apr 2005
Posts: 8,524
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Thanks for the update.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
ā€˜65 Chevy Biscayne 4dr 230 I-6 one owner (Iā€™m #2)
ā€˜39 Dodge Businessmans Coupe


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