Battery drains over a few hrs.
Senior Member
True Car Nut
Joined: Feb 2014
Posts: 2,878
Likes: 1,097
From: Worcester, Ma.
Do you know how to do a parasitic draw test with an ampmeter?
Disconnect neg batt terminal(nothing on, no key in ignition)........attach a jumper cable between neg cable and and neg terminal of batt.....wait at least 10 minutes......now attach meter in parallel with jumper(meter set to amps)....now disconnect/remove jumper....you will get a true amperage reading with all the modules asleep......if reading is well in excess of 30 ma/0.030A, then start pulling the fuses and the circuit breaker, one at a time, until the reading drops to about 30ma....
Disconnect neg batt terminal(nothing on, no key in ignition)........attach a jumper cable between neg cable and and neg terminal of batt.....wait at least 10 minutes......now attach meter in parallel with jumper(meter set to amps)....now disconnect/remove jumper....you will get a true amperage reading with all the modules asleep......if reading is well in excess of 30 ma/0.030A, then start pulling the fuses and the circuit breaker, one at a time, until the reading drops to about 30ma....
Senior Member
True Car Nut
Joined: Jun 2003
Posts: 7,270
Likes: 465
From: Las Cruces, NM
Do you know how to do a parasitic draw test with an ampmeter?
Disconnect neg batt terminal(nothing on, no key in ignition)........attach a jumper cable between neg cable and and neg terminal of batt.....wait at least 10 minutes......now attach meter in parallel with jumper(meter set to amps)....now disconnect/remove jumper....you will get a true amperage reading with all the modules asleep......if reading is well in excess of 30 ma/0.030A, then start pulling the fuses and the circuit breaker, one at a time, until the reading drops to about 30ma....
Disconnect neg batt terminal(nothing on, no key in ignition)........attach a jumper cable between neg cable and and neg terminal of batt.....wait at least 10 minutes......now attach meter in parallel with jumper(meter set to amps)....now disconnect/remove jumper....you will get a true amperage reading with all the modules asleep......if reading is well in excess of 30 ma/0.030A, then start pulling the fuses and the circuit breaker, one at a time, until the reading drops to about 30ma....
Most multi meters are not rated to handle beyond 10 amps unfused.
If the battery is going dead in a matter of hours, I am concerned that this may exceed that typical 10 amp maximum.
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