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To check a draw on a circuit you need to decide a few things and think about you situation.
- What am I trying to do. I have an unexplained draw? I want to know how much this circuit is drawing while operating? Is it blowing fuses or cycling the breaker?
- What tools do I have available?
- Do I have a wiring diagram?
If we have a draw on the system killing the battery and we have a test light. We can disconnect the battery and place the test light between the battery terminal and the cable. A draw of consequence should light the bulb dimly. Then we start removing fuses and checking the light until the offending circuit is found.
If we have a ammeter we can determine what amperage is being drawn, what circuit is drawing and so on using basically the same techniques.
To figure out what is wrong a wiring diagram is invaluable as it will be a map to tracing the circuit through the car.
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∙ 11y ago
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