Dead Batteries

Do you have anything aftermarket that has been installed? CB, Amp, Aux lights, etc? If not, skip next line. If you do, I would start checking those first. Disconnect the power wire, pull the fuse etc and see if the problem goes away. If not, it is something to do with the OE wiring. Check for an open relay, etc.

If you plan on storing the truck for some period of time, pull the IOD (ignition off draw) fuse in the fuse panel. It's the one with the plastic shroud around it (as it's intended to be pulled out for storage purposes). If this is going to be a regular thing, consider a battery tender.

If you suspect a problem beyond the normal IOD current, hook a multimeter capable of measuring up to 10A of 12VDC (most multimeters can do this - they have a separate positive terminal to hook the probe to) inline between the battery and the +12V cable. Read the current draw, and pull each fuse individually while observing the current draw. This will tell you which circuit is drawing the current.

Sure, one up me Tom!

punkin:

He'll probably find several. Relays are supposed to be open when something isn't turned on, punkin.

Good info ... thanks guys. Is the IOD fuse in the dash panel fuse block or the under hood fuse panel?

Fred

Hi Again...

Tom ... would you know what the "typical" IOD draw might be?

Thanks again

Fred

Dash panel - it's the only one with a plastic shroud around it, to make it easier to pull out.

Less than an amp, as long as the dome light is off. Make sure the door is closed, or at least the pin switch depressed, when you're testing it.

Thanks very much Tom ... will check it out ... really appreciate your help.

Best regards Fred