Brake Light Flasher problem. Stumped! - JeepForum.com
 
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post #1 of 10 Old 07-27-2011, 10:19 PM Thread Starter
boomvader
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Brake Light Flasher problem. Stumped!

Upon the completion of my re-assembly, all of my lights worked. However, I am now facing a weird issue with my rear left brake light and hazard flash on the same left rear light. All other lights work as they should.

This is only occurring on my driver's side tail light. I even replaced the entire light with a new one to no avail.

Left rear Signal light - works
Left rear Tail light - works
Left rear backup light - works
Left rear Brake light when no other lights are on - FAIL
Left rear Brake light when tail lights on - FAIL
Left rear Brake light when hazards on - FAIL

****Left rear Brake light when left signal light is on - WORKS!***

Any ideas on why this is not working in the 3 scenarios above?


-boom

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post #2 of 10 Old 07-27-2011, 11:12 PM
BagusJeep
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Is the brake light flashing? Is it the same brightness as the other brake light? Do you have the flasher on AND standing on the brake pedal to get it to light up?

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post #3 of 10 Old 07-27-2011, 11:54 PM
Mickey_D
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Sounds like your turn signal switch.

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post #4 of 10 Old 07-28-2011, 12:19 AM
BagusJeep
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It is an interesting one as the power feed to the Tail lamp is fed from a white wire that goes through the harness to the back left light then across to the back right light. The earthing is from the lamp fitting to the tub locally.

The back right light is working so the power should be there in the wire.

The earthing must be working as the other lights in the cluster work. (I use the word "must" with some caution)

That only leaves the fitting itself and a tracking across the surface of a 30 year old rusted lamp holder.

Have you measured the voltage at the contacts in the lamp holder relative to the earth? Have you checked for corrosion?

BagusJeep lives in Bali.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
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post #5 of 10 Old 07-28-2011, 02:58 AM
John Strenk
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OK, the signal light and the brake light are on the same filament in the bulb so if the bulb flashes with the turn signal then the bulb and circuit is good. And as Bagus jeep states, the ground "must' be working.

So I agree with Mickey D and the problem must be in the turn signal switch. Try getting some spray cleaner and spray around inside with it to see if you can dislodge some dirt. But maybe the springs that hold the contacts in place might of rusted away.


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post #6 of 10 Old 07-28-2011, 08:49 AM
Mickey_D
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Sorry, it was late last night and I was too tired to put more than a couple words.

Power for the brake lights comes up from the brake light switch. It goes to your turn signal switch where it is either routed direct to the bulb (no turn) or it is routed through the turn signal flasher to the bulb (turn).

As John said above, the parking lights use one filament in the bulb. The turn and brake use the other. So if you are getting signal to the bulb through the turn signal, your wiring in the arse end of the Jeep is fine.

It is 100% your turn signal switch isn't connecting the brake light signal to the rear harness when not in a turn status.

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post #7 of 10 Old 07-28-2011, 08:52 AM Thread Starter
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Thanks, guys! I will investigate the TSS today and report back. Much appreciated.

-boom

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post #8 of 10 Old 07-28-2011, 05:11 PM Thread Starter
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Quote:
Originally Posted by John Strenk View Post
OK, the signal light and the brake light are on the same filament in the bulb so if the bulb flashes with the turn signal then the bulb and circuit is good. And as Bagus jeep states, the ground "must' be working.

So I agree with Mickey D and the problem must be in the turn signal switch. Try getting some spray cleaner and spray around inside with it to see if you can dislodge some dirt. But maybe the springs that hold the contacts in place might of rusted away.
Quote:
Originally Posted by Mickey_D View Post
Sorry, it was late last night and I was too tired to put more than a couple words.

Power for the brake lights comes up from the brake light switch. It goes to your turn signal switch where it is either routed direct to the bulb (no turn) or it is routed through the turn signal flasher to the bulb (turn).

As John said above, the parking lights use one filament in the bulb. The turn and brake use the other. So if you are getting signal to the bulb through the turn signal, your wiring in the arse end of the Jeep is fine.

It is 100% your turn signal switch isn't connecting the brake light signal to the rear harness when not in a turn status.
Problem solved. It was indeed the turn signal switch. Replaced it with an OEM from the dealer. I was surprised to find they had it in stock. Works great!

You guys really helped me out. I learned something. I didn't realize the TSS could impact the brake lights. Thanks VERY much!!

-boom

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post #9 of 10 Old 07-28-2011, 06:23 PM
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Good to hear, and thanks for the feedback on a solution.

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post #10 of 10 Old 07-29-2011, 01:44 PM
Mike Romain
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Quote:
Originally Posted by boomvader View Post
Problem solved. It was indeed the turn signal switch. Replaced it with an OEM from the dealer. I was surprised to find they had it in stock. Works great!

You guys really helped me out. I learned something. I didn't realize the TSS could impact the brake lights. Thanks VERY much!!
Yup, it is a sneaky one, the turn signal has to interrupt the brake light so all the power runs through the switch, same for the emergency flashers.

Mike
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