I am have a problem on my 2000 jeep cherokee. both of the brake lights keep melting, but the 3rd brake light is fine. I have replaced both sockets several times and finally gave up. Took it to the dealer and, they being so smart said it needed a simple $5.00 bulb. WOW.. nope didn't work and now they are screwing me. any ideas on where else I should check? Brake pressure switch ohmes? any ideas?
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Re: Burning up both brake light sockets
First, I'd check voltage at brake light socket terminals. voltage should be the same or slightly lower than running voltage recommendation of about 13.5. (check running volts at battery with engine running. check brake light volts again with engine running, using the bulb terminal and socket as power source and ground.) If voltage is excessively high, I'd look at the charging system to find out why. If volts at battery are normal but volts at socket are low, I'd suspect a bad ground in the lighting circut, causing excessive resistance & heat, causing sockets to melt. If this is the case, re-ground both light sockets to a good ground source such as the chassis. (when attaching, scrape off paint, rust etc to insure good connection.
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Sounds like one of your bulb sockets is shorted out. I have seen bulbs almost melted in their sockets, on grand cherokees in the past. You will have to check all the brake light and bulb sockets to see if they are shorted.
the problem is the metal contacts inside the lense itself,the socket make contact with the little metal tabs, bent mine out a hair or 2 ,and never had another problem with the brake light not working on my drivers side.
YES -- process of elimination. Obviously there's a short circuit in the Brake/Headlight circuits - right? Blown fuse(s) is/are evident of this -- would you agree? Which fuse(s) is/are blowing? An analysis tells you that the only time a fuse blows is when the headlamps are turned on -- correct? Otherwise, brake lights work normally -- right? OK. Head lamps have relays which turn them on. Here's a wiring diagram of the 2000 Hyundai Sonata (NOT the Jeep Grand Cherokee)
It would appear the problem is with one or more bulbs or sockets or both. As you many notice, there are no connections between the headlamps and brake lamps except the parking lamps (which share the bulbs/sockets)
When the headlamps are turned on, so does the tail lamp relay. As you can see, these bulbs/sockets are 'DUAL' filament to ground (series-parallel circuit). Just a guess here - the short is in one of the lower rear brake/parking lamp bulbs/sockets.... just a guess.
have you checked the bulb sockets to see if they are burnt or corroded sometime i see that the plastic melts around the contacts where the socket twists into the housing. if your lucky you might get away with replacing just the socket for the brake/running light bulb. but if it is too melted your most likely going to need a new housing
i have a 2002 jeep grand cherokee i had the same problem when i would apply my brakes when the headlights were on my brake lights would go out, i found that my bulbsocket was not making good contact with the socket housing, if you notice when you take off a bulb, look at the light fixture where you unscrewed your breaklight bulb you will notice 3 medal contacts-they should be silver in the socket housing and like a copper on the socket bulb, in the socket housing their should be 2 silver contacts together and 1 by itself the one that looks by itself is making bad contact with the copper one thats by itself on the bulb, what you can do for a quick fix is; get a small piece of low cage wire or a thin piece of metal like copper stick that in to the bottom or top of that metal contact--i did it through the bottom leave the wire or piece of medal sticking out enough for where it can get contact with the bulb (just a little wire is enough to make contact, now screw the bulb on and test it---it will work----i did it to mine, if you need more assistance let me know email@example.com