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Unread 07-12-2014, 10:27 PM   #1
spottedfrog
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1979 CJ5 
 
Join Date: Sep 2010
Location: Grand Junction, Colorado
Posts: 828
electrical problem WTF???

So I parked the Jeep for the night. I just looked out side the window and the taillights were illuminated! the ignition is off, the headlights are off the volt meter is at zero. nothing is on except the tail lamps.
this is the 1st time this has ever happened.
I disconnected the battery so the Jeep wont catch fire tonight.

Where do I even start to track down the problem. Electrical is my weak point for sure.

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Unread 07-12-2014, 11:03 PM   #2
Kstein
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1985 CJ7 
 
Join Date: Dec 2010
Location: Houston, Tx
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thinking out loud.....

I think the backup lights and/or the brake lights are on an always-hot circuit (not controlled by the ignition switch.)

Could the brake light switch be bad?
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TAMC85 CJ7
Still Original: Tub, Rollbar; Frame; 258 Block; T176; DANA300; Steering; DANA30; AMC20; Drive Shafts; Wheels; Tank; Altenator; Fan; Frt Bumper; Speedo; Heater Box; Spare Carrier; Seat risers
Replaced: Radiator; Valve Cover; Clutch linkage; Taillights; Frt Brake Calipers; Fuel, Tmp, and Oil Pressure Gauges; Exhaust line; Seat Belts; Paint
Mods: Mopar MPI(in progress); 4.0 Al Cylinder Head; OME YJ Suspension; MC Seats; Tub liner; 31" Tires
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Unread 07-12-2014, 11:29 PM   #3
spottedfrog
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Quote:
Originally Posted by Kstein View Post
thinking out loud.....

I think the backup lights and/or the brake lights are on an always-hot circuit (not controlled by the ignition switch.)

Could the brake light switch be bad?
Could be its 34 years old.
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Unread 07-16-2014, 05:28 PM   #4
carnuck
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1984 J-Series Truck 
 
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Someone install a stereo incorrectly?
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Unread 07-16-2014, 05:51 PM   #5
lucdog
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Location: , Il.
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Quote:
Originally Posted by Kstein
thinking out loud..... I think the backup lights and/or the brake lights are on an always-hot circuit (not controlled by the ignition switch.) Could the brake light switch be bad?
Or just need to be adjusted.

And it's the brake lights.
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 07-16-2014, 06:41 PM   #6
spottedfrog
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Join Date: Sep 2010
Location: Grand Junction, Colorado
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No stereo. It has never done this before, so the adjustment shouldn't have been an issue. I swapped out the switch and so its ok. BUT it was fine previously too....time will tell I guess.
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Unread 07-16-2014, 07:01 PM   #7
lucdog
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Quote:
Originally Posted by spottedfrog
No stereo. It has never done this before, so the adjustment shouldn't have been an issue. I swapped out the switch and so its ok. BUT it was fine previously too....time will tell I guess.
:-) everything is usually fine till it breaks or wears out
__________________
1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 07-16-2014, 07:55 PM   #8
zillla
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1975 CJ5 
 
Join Date: May 2009
Location: Wyoming
Posts: 776
Could it be a reflection or light shining in the tail lights? These things can be a real pain to track down. I'd start with an OEM wiring diagram and chase it out. Otherwise I'd start at the light switch
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