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Search Auto Parts Search Battery won't charge when running a/c Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical 77towncar New User Oct 7, 2010, 5:13 PM Post #1 of 4 (1140 views) Battery won't charge when running a/c Sign In I have a 1977 Lincoln Continental Town Car, recently the battery repeatedly needed boosting to start. I had the alt. tested, and it was bad. I removed the alt. and had it rebuilt and reinstalled it. This problem persists, when I boost it and allow it to idle it will restart, but when I run the a/c- idling or driving- and kill the engine it will not restart and requires another battery boost. I love this car and want nothing more than to drive it. Need help. Hammer Time Ultimate Carjunky / Moderator Oct 7, 2010, 5:41 PM Post #2 of 4 (1136 views) Re: Battery won't charge when running a/c Sign In What's the charging voltage now? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. 77towncar New User Oct 8, 2010, 11:16 AM Post #3 of 4 (1126 views) Re: Battery won't charge when running a/c Sign In When battery is charged with engine running voltage is between 13.4 and 13.7. With a/c running voltage drops to about 12.5. It seems to have an effect on the blinkers and brake lights also, turn signals wont work well when battery charge is low. I am at a loss to understand what is going on. I replaced the negative cable from the batt. a while back because it was in bad shape, so that cant be the problem. Could it be a problem with the voltage regulator? Wiring problem? Battery also checked out good a month or so ago and is only a couple years old. Hammer Time Ultimate Carjunky / Moderator Oct 8, 2010, 12:04 PM Post #4 of 4 (1122 views) Re: Battery won't charge when running a/c Sign In You have some alternator problems. Does it have an external regulator? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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