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I read some instructions in a car factory manual for a battery drain test. It says to put a jumper in parallel to the ammeter between the disconnected negative cable and battery post. Wouldn't that defeat the purpose of the ammeter and not give any useful reading? Am I misunderstanding something?
4. Connect a fused jumper wire (30A) between the negative battery cable and the negative battery post to prevent modules from resetting.
5. Disconnect the negative battery cable from the negative battery post without breaking the connection of the jumper wire.
6. NOTE: It is very important that continuity is not broken between the battery and the negative battery cable when connecting the meter. If this happens, the entire 40-minute procedure must be repeated.
Connect the battery tester between the negative battery cable and the post. The meter must be capable of reading milliamps and should have a 10-amp capability.
4. Connect a fused jumper wire (30A) between the negative battery cable and the negative battery post to prevent modules from resetting.
5. Disconnect the negative battery cable from the negative battery post without breaking the connection of the jumper wire.
6. NOTE: It is very important that continuity is not broken between the battery and the negative battery cable when connecting the meter. If this happens, the entire 40-minute procedure must be repeated.
Connect the battery tester between the negative battery cable and the post. The meter must be capable of reading milliamps and should have a 10-amp capability.
