Questionhazards do not work car is completely dark like there is no battery had it tested said it was ok i di get 12 volts through the fuse box when i check the battery voltage through the red wire with yellow srtip on it it is 5 volts with the key off with it on it is 1 volt when i unhook the connection between the wire harness coming from the engine bay and the harness under the dash i get constant 12 volts on the wire?
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sorry a 1994 lebaron conv. 3.0 used the battery ground under the hood and a metal support under the dash for ground. i unhooked the battery and did contunity from the ground cable to the engine and body of the car. battery was bought feb 05 when i hook the meter up on the back of the fusebox inside the car it reads now 7 volts when i turn the headlight switch on it goes to 5 volts when i turn the ign aswitch on it goes to 1 volt?
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have 12 volts at battery 12 volts coming out of fuse box under hood at fuse box in car got 5 volts car has no electrical at all no lights no dash no nothing comletely dark tried new ingnition switch (was guesing on that one}im lost any ideas would help
Answer -
Hi James,
Can you tell me the year and model of your car?
And exactly where are you measuring the voltages that you report: include where the ground lead of the meter is positioned? My first thought is the battery is so weak that it can't deliver any kind of current downstream but that is a stretch. I really need to know more.
Have you checked the body grounds of the wires attached to the clamp on the - post of the battery? How old is the battery?
Roland
Answer -
Hi James,
O.K. I have those diagrams. I would begin by trying the hazard flasher which is directly wired to the battery. If that works then the battery and the ground return is probably o.k. But if not, then I would suspect the ground wires that are to the body and the engine that are attached to the - clamp of the battery.
Then I would check the voltage on each of the fuse sockets in the power distribution center under the hood. There is an internal buss wire that supplies all of them directly from the large black wire from the + post of the battery. If you aren't getting 12v on the buss then the black cable is probably corroded or eaten away or has a bad connection.
If you have 12v on the buss then I can't understand why you shouldn't have 12v to virtually all the fuses in the cabin.
So give those a shot and see what you find.
Roland
AnswerThanks for the kind evaluation and nomination. Yes, the hazards not working would get right to the base of the problem because it by-passes all the power wires and fuses. So we learn that voltage is one thing but current delivery is another factor.
Roland
