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  #1  
Old 05-04-2006, 06:19 PM
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IslanderOffRoad IslanderOffRoad is offline
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Brake Lights Not Working

Tail Lights = good
Turn signals = good
Hazards = good
Reverse Lights = good

Brake Lights are the only thing I'm having problems with, and thats probably the most important one to have! Bulbs and fuses are all good, whats the next step in diagnosing this problem?
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  #2  
Old 05-04-2006, 06:33 PM
Ristow Ristow is offline
 
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power to the switch?getting through the switch?

also,the power to the brake lites runs through the turn signal switch,the switch determines which brake lite blinks,for the signal.
i simply had to clean the switch on my 74 j10 to get the brake lites working.
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  #3  
Old 05-04-2006, 07:39 PM
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check and clean all the ground connections.
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  #4  
Old 05-04-2006, 07:51 PM
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Millerluck Millerluck is offline
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Do you have trailer lights wired in? PO hacked into the wires under the bumper on my GW. Has them stupid blue splicer deals. My right rear running light would not come on way back when....so I started looking around till I found that rat nest.

Just a thought.

Later

Larry Miller
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  #5  
Old 05-04-2006, 08:02 PM
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Did you do the eyeball test or did you hook up a meter and test everything? That ole dusty trusty ohm meter is a life/time saver. He'll tell you if you have sufficient voltage, ohmage, and groundage, and in less time than you can spend looking and tugging.

Topher-just a thoughtage
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  #6  
Old 05-04-2006, 08:09 PM
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J10Joe J10Joe is offline
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i had the same problem, because of trailor light hook ups. clean that up, and clean gorunds. good wires and bad ground will give you many headaches. GET GOOD GROUNDS. sorry to shout.
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  #7  
Old 05-04-2006, 10:28 PM
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Justin Kerns Justin Kerns is offline
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Quote:
Originally Posted by Ristow
power to the switch?getting through the switch?

x2. I just fixed mine after a lengthy struggle. If your turn signals work you most likely don't have power to the brake switch. Check that first.

Mine was dead and a wire was stripped and shorting between the switch & the fuseblock. Cleaned it up, replaced the fuse (always a good thing to check) and I was good.

Thanks to Ristow for the tip that helped me find the obvious!
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  #8  
Old 05-05-2006, 12:40 PM
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I did fuses yesterday, thats how I got the hazards working again.

The switch you guys are referring to is the one on the brake pedal support bracket right?

It does have trailer braking hooked up.... I'll have to check that out.
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  #9  
Old 05-05-2006, 01:34 PM
docb69 docb69 is offline
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Cruise Control Module

I ran into a fun problem with my brake lights. The switch had no power because I had disconected the cruise control unit and it was the relay for the brakes. It took forever to figure it out. Solution was replace the relay in the fuseblock and bypass the connections under the dash.
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  #10  
Old 05-05-2006, 04:54 PM
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IslanderOffRoad IslanderOffRoad is offline
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Seeing as the turn signal/hazards work, I'm assuming its a bad brake switch. I pulled it today, tried activating it by hand hoping it just needed adjustment, no such luck

where can i pick one of these up? vatozone doesnt have it listed as available
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  #11  
Old 05-05-2006, 05:54 PM
Ristow Ristow is offline
 
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i'll have a used one you can have.
but,my signals worked too,with no brake lights,and it was the turn signal switch,which just needed a good dunk in the parts washer to get the old dielectric grease and dirt out of it.
you need to check the switch with a multimeter,or,make a jumper wire,plug it into the plug going to the brake switch,and see if your brake lights are on.
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Quote:
Originally Posted by Hankrod
Ristows right.................again,


→ Where the kids hang out...

It's like you're unraveling a big cable-knit sweater that someone keeps knitting...and knitting...and knitting...and knitting...
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  #12  
Old 05-15-2006, 11:32 PM
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IslanderOffRoad IslanderOffRoad is offline
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ok, got the new brake light switch.. no dice, although now my dash light comes on for the e-brake!

i'm moving to the turn signal flasher next. i tried to pull it, but it didn't seem to want to come out. was it relatively easy to remove for you guys? is there a trick I'm missing?
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  #13  
Old 05-16-2006, 06:16 AM
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should pull straight out. Do your hazards work?
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1985 J-10 LWB
258/727/NP208
4" lift, TFI, MC 2100

1988 J20-one of the last ones
8400 GVRW
360/727/208
TFI, Rustolium (brushed)
Fisher/Meyers plow truck
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  #14  
Old 05-16-2006, 12:49 PM
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IslanderOffRoad IslanderOffRoad is offline
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yes they do
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  #15  
Old 05-16-2006, 01:36 PM
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Quote:
Originally Posted by IslanderOffRoad
yes they do

try the flasher then, but my $$ is still on a bad ground wire back there.
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1985 J-10 LWB
258/727/NP208
4" lift, TFI, MC 2100

1988 J20-one of the last ones
8400 GVRW
360/727/208
TFI, Rustolium (brushed)
Fisher/Meyers plow truck
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  #16  
Old 05-16-2006, 04:42 PM
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IslanderOffRoad IslanderOffRoad is offline
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This is driving me crazy... so far I've replaced:

Brake light switch
Turn signal flasher
Fuses

Turn signals work
Hazards work, but blow a fuse on occasion.
Brake lights, nothing.

I found a wire comming off the brake light switch going to the glove box of all places... looks like the glove box light is tied into this circuit? The bulb is missing there, could that be screwing up the brake circuit (AMC did some weird stuff)?

How far into the body are the rear light grounds? Looks like thats the next step.
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  #17  
Old 05-16-2006, 06:01 PM
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http://oljeep.com/gw/elec/83/83_FSJ_...ent-Access.jpg

this should be right for your jeep. grounds look like this:


_______
____
_

there should be groounds coming off your rear maker lights, going to the frame. clean them up you can find them, make new ones if they're not there anymore
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1985 J-10 LWB
258/727/NP208
4" lift, TFI, MC 2100

1988 J20-one of the last ones
8400 GVRW
360/727/208
TFI, Rustolium (brushed)
Fisher/Meyers plow truck
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  #18  
Old 05-16-2006, 06:16 PM
Ristow Ristow is offline
 
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the cruise box is under the passenger side dash,that is probably where the wire from the brake switch is going.

inspect the big flat connector for the wires going into the steering column,it will be clipped to the right side,down under the dash,on the side of the column,make sure all the connections are clean,tight,not burned,and check for broken wires there.

have you checked the turn signal switch yet?
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Quote:
Originally Posted by Hankrod
Ristows right.................again,


→ Where the kids hang out...

It's like you're unraveling a big cable-knit sweater that someone keeps knitting...and knitting...and knitting...and knitting...
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  #19  
Old 05-17-2006, 01:00 AM
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turn signal switch or flasher?

i replaced the flasher this afternoon.
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  #20  
Old 05-17-2006, 06:01 AM
Ristow Ristow is offline
 
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Quote:
Originally Posted by IslanderOffRoad
turn signal switch or flasher?

i replaced the flasher this afternoon.
the turn signal switch,in the steering column.the power to the brake lights is send through that switch,because,when you use the turn signals,that switch determines which light flashes (signal) and which light shines steady (brake light).if the turn signal is not engaged,both brake lights will shine.i had the same problem as you,had signals,hazards,tail,but no brakes.looked everywhere,finally traced power to the column,power was going in,but not coming out of the switch.i simply had to clean the switch assembly,my truck is a working project,a little rough so i just hosed it down with some solvent,while in the column,and shot some grease in there. if your truck is nice,remove the switch for cleaning and dielectric greasing,it's not that hard.try this,lean a piece of cardboard against the back of the truck on the drivers side,so you can see the tailights reflection on it.hold the brake pedal down,and firmly wiggle the turn signal stalk up an down,and fore and aft,see if they flicker.if not,clean the swith anyway,and move down the trouble shooting list.
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Quote:
Originally Posted by Hankrod
Ristows right.................again,


→ Where the kids hang out...

It's like you're unraveling a big cable-knit sweater that someone keeps knitting...and knitting...and knitting...and knitting...
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