I have a constant .23 amp draw on my 1999 Ford F150. When I pull fuse #15 from the cab this drops to around .02 amps. I have experienced problems with a dead battery after overnight sitting. What is a normal amp draw on a Ford F150 with ignition off? I originally pulled fuse 103 from under the hood which led me to the cab fuse box.

New battery installed in June, worked fine to early September. Drove from GA to IL early September. Battery dies again. Replaced battery. Good for a day. Charged battery, parked truck with battery cable unhooked. Starts every morning when cable is attached.

 

15 5A Stop Lamp Switch, (Speed Control, Brake
Shift Interlock, ABS, PCM Module Inputs),
GEM Module, RABS Test Connector

Does your cruise control work? Has it had the recall done? Are your brake lights stuck on?

 

You must wait up to 40 minutes for the battery saver to time out before making your measurement.

230 mA sounds right for current draw before timeout due to the GEM module pulling power. After timeout, it should fall to around 70 mA or less.

 

Generally speaking most cars are 10-20mA after fully going into sleep mode

 

I've measured 50 mA on my King Ranch, once the system is completely powered down. Things like the clock, radio presets, environmental temperature control, seat position memory and keyless entry are all contributors.

- Jack

 

Thanks for the input. Cruse control does work. I am not aware if the recall has been done for that item. I have had a gas tank strap recall and some wire harness done about a year ago. I'll have to find those records. The amp measurements were taken inline from the negative post set on 10A and showing .22, sometimes .23. Truck had been sitting for over an hour with no change in the draw.

 

Oh, stop lights are not stuck on. Just noticed my ABS light came on today while driving.

 

Just to clarify, that "up to 40 minutes" means you cannot touch ANYTHING during that interval including the ammeter's connection, any doors, switches, lights etc. You hook up the meter and step back until the battery saver relay kicks out (you can usually hear it if you're close by).

 

I shut it off, hook up the inline ammeter... measures .22A and come back in an hour, nothing touched, still measuring .22A, two hours later, still. .22A.

 

We had a break out tester for this purpose. Basically you can make one with a threaded battery terminal disconnect. To check the circuit in sleep mode you can't break the circuit, and then add the meter inline. It has to have the meter inline before disconnecting the main circuit.

It is very difficult to do it without a break out. You'd have to simultaneously hold the meter lead on a battery post, slide the cable up off the battery while holding your other meter lead on the cable.



This is what I was picturing in my head as an alternative that you can probably find locally
http://www.harborfreight.com/media/c...mage_12541.jpg


This is similar to my setup for work, but it has battery cables and terminals off the post of the switch.
http://static.speedwaymotors.com/RS/...91064502_L.jpg