Truck keeps dying!!!!

[greg64]

Poorboy has the technique. You need to first discover if you have a leaky circuit (probably). At least knowing that will put an end to new batteries.

Another suggestion I have is to disconnect the battery completely while testing and use a battery charger to power everything while the meter is in the circuit. This will provide a natural "current limit" so you don't fry the meter when you find the problem. On these old trucks lots of circuits are unfused, and you might have a wire where the insulation is worn through enough to lightly contact ground. But, when you discover this, you may "fully" complete the circuit and spike the current. In fact, this is likely because if the circuit was grounding out after the load (light, etc), the light would be partially on. Since you're not seeing this, it is probably a hot wire that is touching ground a bit.

Just be meticulous about your checks and you'll find the problem in no time.