Question about 1994 Cadillac DeVille

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When trying to start my 94 DeVille it was completely dead. Absolutely no dashboard lights or other electrical response except for a very faint but high pitched noise that seemed to be coming from the dashboard. I then jumped the battery with my other car and it started. I let the car run for several minutes then I decided to turn on the headlights. As soon as I pulled on the headlight knob the engine quit as if someone threw a switch. I tried the jump again, but nothing. In the meantime I had opened the trunk and because the car had quit running was unable to close the trunk because the electrically powered latch did not raise up I could not close the trunk. I thought this might be a simple battery problem but I suspect otherwise. What do you think?

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Sounds as if the Alternator is not charging, alltough it could be a bad battery. Check the connections on the battery and make sure the cables are tight. Jump the car again, and if it starts check the alternator for output, it should be putting out close to 17 volts if the battery is dead. If the alternator charges then you probably have a battery problem, and need to replace the battery.

Posted on Apr 24, 2010

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Sounds electrical. A very dead battery will take some time to recharge, I would not have burdened it with anything within the first hour of running the engine. The head lights are heavy users of power, far exceeding the power needed to to keep your engine running, but even so the alternator should have provided enough juice to keep the car running. When you try to jump start it make sure the lights are off. The other car from which you are getting the jump should have its engine running to maintain charge. Connect the jump leads really securely. By connecting and disconnecting the jump leads the drop in engine note from the other car as it works harder will tell you current is being drawn when the leads are connected properly. Allow the two cars to sit for ten minutes with the jump leads connected before trying for a restart. This will allow your car battery to gain with some residual charge. When starting turn the ignition to the first position and make sure all ancillary items are off (heater, fan, lights, air con etc), turn to second position and wait ten seconds before engaging the starter. Check all fuses. Take the battery to a fast fit auto centre and they can run a diagnostic on it. Even when discharged they can pick up on additional faults such as a missing cell which will cause difficulties in recharging and maintaining other electrical operations. If the battery is healthy have the alternator function checked, it could be that you have been driving around for some time living off a battery that has not been receiving any charge due to a faulty alternator

Posted on Apr 24, 2010

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