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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / June 20051986 jag xj6 no brake lights
I have all good bulbs and a good switch at the pedal, but I am not getting break lights to come on. I dont have 12 volts at the switch. I have like 0.2 volts. Strange indeed. Fuses seem ok although I am confused as to which fuse actually is for those lights but I have no bad ones. I'm all through my manual on this one. any ideas are appreciated. Ed Check the voltage coming from the turn signal switch. If memory serves me correctly, power comes from the fuse marked stop/turn/tail or something like that, to the turn signal sw. then to the stop light sw. At .2v sounds like a bad contact the turn sw. to the stop sw. by the brake pedal. You can prove this by taking a jumper wire from somewhere on the fuseblock thats easy to get 12v from and go to hot side of the brakelight sw. I use paperclips to get on the backside of the connectors. If you get brakelights, most likely bad contact at the turnsignal Sw. Good luck, Rick thanks. The switch on the brake pedal has a normally closed switch on it. I think thats mighty wierd. (it opens when I press the pedal down, I checked) there is some little device with a capacitor on it next to that switch. Sure is a wierd car, but ya gotta love it. Had my fill yesterday between this and a fuel leak issue on one tank, so I bailed for the night. Will be looking more tonight. Ok! Ed Then it sounds like the brake switch activates a relay in the curcuit, which is open till you press the brake pedal. Still, I don't think it rules out a problem with the turn signal Sw. though. Rick Update: Tracing problem, with the assistance of diagrams, to the "bulb alarm" circuit. ugh! Do the signals work? How about the emergency flashers? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's > Update: > Tracing problem, with the assistance of diagrams, to the "bulb alarm" > circuit. > ugh! signals all work, as do the flashers. the flasher switch is a tad funky though. The power has to go through that switch. It sure wouldn't be the first time a bad flasher switch has taken out brake lights.... But then your Jag might be under recall for broken wires in the trunk wiring harness.... Could maybe be the trouble? Long shot but hey. Make : JAGUAR Model : XJS Year : 1986 Manufacturer : HESS AND EISENHARDT CO. NHTSA CAMPAIGN ID Number : 87V025000 Recall Date : FEB 25, 1987 Component: ELECTRICAL SYSTEM:WIRING: REAR COMPARTMENT/TRUNK Potential Number Of Units Affected : 23 Summary: ELECTRICAL WIRING HARNESS MAY HAVE BEEN INCORRECTLY INSTALLED AND COULD CAUSE A SHORT CIRCUIT. Consequence: SHORT CIRCUIT COULD RESULT IN A ELECTRICAL FIRE. Remedy: REROUTE HARNESS; IF CHAFED OR DAMAGED CONDITION WILL BE CORRECTED. Notes: SYSTEM: ELECTRICAL WIRING HARNESS.VEHICLE DESCRIPTION: PASSENGER CARS. JAGUARS MODIFIED BY HESS AND EISENHARDTDOMESTIC MANUFACTURER. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's > signals all work, as do the flashers. the flasher switch is a tad funky > though. hmmm. well, I shall check it. The flasher switch isn't really in the best of shape nor was my tank changeover switch. . thanks. > The power has to go through that switch. It sure wouldn't be the first > time a bad flasher switch has taken out brake lights.... [quoted text clipped - 30 lines] > > signals all work, as do the flashers. the flasher switch is a tad funky > > though. Not all lights flash. They will work without the flash on, but not on flash. Like one left side light works normal, but not on flash, and right one is fine. so, I'll have a nice weekend to play. > Do the signals work? How about the emergency flashers? > [quoted text clipped - 6 lines] > > circuit. > > ugh! Ok, there are likely 2 separate circuits. On a lot of older vehicles I have messed with, the running lights use a wiring harness ground and the brake and signals use a body ground. If the bolts that hold the rear fixtures on have rusted, they will not conduct anymore. You might want to run a booster cable from the battery negative to the light fixture and see if that allows it to work. Good luck. Mike > Not all lights flash. They will work without the flash on, but not on > flash. [quoted text clipped - 12 lines] > > > circuit. > > > ugh! Well, a big part of fixing this was to find the correct switch. Apparently I have been working with the cruise-control cutoff switch all along. Seeing postings about cruise control on anothyer vehicle made me think. Since my cruise control has never worked since I had the car I forgot it even had it! All I needed to do was make a slight adjustment to the actual brake switch and problem is solved. so there you have it..... thanks for the replies!!! > Ok, there are likely 2 separate circuits. > [quoted text clipped - 26 lines] > > > > circuit. > > > > ugh! |
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