I have a 2008 Ford Ranger with a good battery, good connections, good alternator, etc. I have been trying to,figure out why the battery is draining overnight only. This happened twice and both times
Switch your Digital Multi meter to DC AMPs. Amps is usually indicated by an "A" on the Multi meter Switch. AC is usually shown as a "~" symbol and DC shown as a "-" symbol. You usually have to move the multi meter positive lead to a separate socket on the multi meter to check for amps. Sometimes there are 2 sockets, (a high range and a low range). Always test on the highest setting first. For example: High setting on your multi meter may be 10 Amp. Test on the 10 Amp setting first, then if the current drawn is less than your Multi meter's (low setting) move to that setting and keep testing. For example: On my multi meter the low setting is 0.3 Amps. Also indicated as 300mA (mA x 1000 = A).
Remove the battery's positive cable.
Connect the multi meter's positive probe to the battery's positive post while simultaneously holding the negative probe from the multi meter up in the air, to keep it away from anything metallic.
Place the negative probe of the multi meter on the end of the removed positive cable to complete the circuit.
That's right, you're putting a negative on a positive, but its ok, because if the drain is severe enough, you're most likely to blow a fuse or two, which will identify the problem area.
Above I said to remove the positive battery cable because that is the way I do it. You can do the same test with the negative battery cable removed. In fact for you that may be a better way to do the test, because there would be no way for any electrical issues to occur by accidently grounding the negative probe from the multi meter. i hope you understand what I'm saying here.
Mar 27, 2014 |
2008 Ford Ranger