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Electrical Repair
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Troubleshooting & Maintenance Tips For your car's Electrical System
- Your car's electrical system should be completely checked and tested every two years or whenever serviced for any type of driveability problem. Many problems associated with day-to-day driveability are caused by voltage variations and must be the first step in troubleshooting any problem. This is due to the use of computerized controls in most cars these days and even quite minor voltage changes can alter the controls.
- Your car's electrical system must be load tested to certain standards, which can be simulated by turning on all the accessories and lights for simple voltage drain but that is not an all-inclusive test. Measuring circuit loads with an ammeter, circuit voltage drops with a DVOM, variable circuit load testing, etc. is the only way to fully check function. With electrical systems operating at 80%-100% of capacity nowadays (see Power Demand Chart), it is crucial that it be up to standards.
- The average do-it-yourselfer would have little need to purchase the more critical test equipment, so if voltmeter testing doesn't pinpoint the problem, get a thorough checkup done from an automotive electrical technician who knows your car manufacturer's system.
- A complete and thorough test involves much more than sticking a voltmeter on the battery and the average do-it-yourselfer does not have the test equipment nor does he/she need it. You should allow a professional to do this test. As a good starting point, though, most major chain automotive parts stores offer a free service test (in the hopes of selling you a battery or alternator) that should be good enough to notify you of any major problems. Most early problems start from poor electrical connections due to loose connections and/or buildup of corrosion, especially at the battery posts. Keep that battery clean!
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