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Re: 1994 9000 CSE Electrical Issue Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 21 Aug 2008 21:36:22
In Reply to: 1994 9000 CSE Electrical Issue, Icedragon, Thu, 21 Aug 2008 11:05:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You note that the car is instantly dead after shutting it off. I assume that means you turn the car off, and when you turn it back to ON, no lights, nothing. It starts with a jump.
when you turn the car off, press the brake pedal. Do the brake lights go on? Does the emergency flasher work? Open the hood and with a voltmeter, measure the voltage on the battery POSTS. Not the clamps, the posts. It should read around 12.6 for a properly charged battery. If you see a lot less, like 10 or less, the battery is bad. If you see 12.6, have someone press on the brake pedal (or put something heavy on it) so the brake lights are on. If the voltage at the POSTS drops down below 12 volts, the battery is bad.
If the battery appears OK, with the brake lights on (creates an electrical load) measure the voltage between the positive POST and the clamp. It should be less than 0.1 volts. If not, the contacts are dirty. Do the same with the negative post and negative clamp. Also, measure between the negative clamp and a nice ground, such as the engine - again, less than 0.1 volts, or the battery cable is bad or the contact to chassis is bad.
If the voltage on the battery clamps seems OK, even under load, and the brake lights and flashers work, but the car won't turn ON, then it could be the ignition switch. But I'll bet it's the battery. When the battery 'tested good', was it load tested? Or just a no load voltage? If the battery can support a load, then I'd check the wires from the battery to chassis (negative) and to the starter/alternator (positive), including the fusable link on the side of the battery box. But that wouldn't explain how the jumper works, Unless when you jump you don't connect both leads to the battery, but say connect the positive lead to the positive post of the battery, but the negative lead to the chassis. That would point to a bad battery ground.
If the jumper is using the same wires as the battery and the car starts fine, it wouldn't be the wires. But if you use a different current path, then suspect the wires.
posted by 99.162.183...
, Thu, 21 Aug 2008 21:36:22 <-- Viewing This Message
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