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85% of all electrical problems are loose or dirty connections. Check at the battery and also at the boosting point under the hood.
Its actually pretty easy to test your battery. An inexpensive digital voltmeter (DVM) hooked onto your battery with all systems off. Voltage should be somewhere between 12.2 volts and 12.7 volts. Now load test by turning on headlights and stepping on brake to activate brake lights. Voltage should not drop below "about" 11.8 volts. Cheap Made in China DVM's are about $10- $20 over here.
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