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clinebarger · 10-05-2011, 04:34 PM

The Test light trick dont work on these newer trucks.

1. Select the highest amp scale on
an ammeter and disconnect the battery negative cable.

2. Install the ammeter between the battery and the battery cable. A jumper wire needs to be connected in parallel to the ammeter to reconnect the battery at the same time the meter remains installed. Both the ammeter and a jumper wire are connecting the battery cable to the battery at this time. This allows the vehicle to power down (go to sleep).

3. Wait 30 minutes. Turn the ammeter on. Remove the jumper wire, being sure that the ammeter does not come disconnected. This is now the actual vehicle's battery drain.

4. Once the amount of the drain has been recorded, remove the fuses one at a time to locate the source of the drain. Leave the fuses out until draw is isolated, as reinstalling may reset timers and give a false draw.

10-05-2011, 04:34 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 07 Classic LBZ CC battery killer The Test light trick dont work on these newer trucks. 1. Select the highest amp scale on an ammeter and disconnect the battery negative cable. 2. Install the ammeter between the battery and the battery cable. A jumper wire needs to be connected in parallel to the ammeter to reconnect the battery at the same time the meter remains installed. Both the ammeter and a jumper wire are connecting the battery cable to the battery at this time. This allows the vehicle to power down (go to sleep). 3. Wait 30 minutes. Turn the ammeter on. Remove the jumper wire, being sure that the ammeter does not come disconnected. This is now the actual vehicle's battery drain. 4. Once the amount of the drain has been recorded, remove the fuses one at a time to locate the source of the drain. Leave the fuses out until draw is isolated, as reinstalling may reset timers and give a false draw.