Battery Drain Injection Drive Module - Ford Powerstroke Diesel Forum
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Old 11-05-2012, 09:29 AM
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Battery Drain Injection Drive Module

I have a 2000 7.3 Lariat, Tekonsha brake controller, 4 gauges, DP-Tuner chip, Banks 4" exhaust, turbo impeller swap, big air filter, AIH delete and a monster Coleman power inverter mounted in the back seat with 2/0 welding wire powering it and a Viper alarm with remote start

I have a draw on my batteries that's slowly draining them to the point of causing hard starts in the morning. I just remembered that I upgraded the glow plug relay to a white rogers the other day and recently replaced the ignition switch, starter relay and neutral safety switch for a no crank no start (it was the neutral safety switch- but now my truck won't crank in neutral). Anyway, I have a customer who owns a stereo shop and he helped me isolate the circuits that are causing the problem. They are:

Location Fuse Purpose Draw
28 30amp Trailer Brake Controller 0.25 amps
27 30amp Injection Drive Module 1.72 amps
21 50amp Ignition Switch B1 & B3 1.07 amps (with brake controller plugged in 0.00 without brake controller)
20 50amp Ignition Switch B4 & B5 0.06 amps

It is possible that the decimal is in the wrong place- like I said, I'm electronically retarded.

1) So, the largest draw is with the IDM. Does this mean the IDM is failing?
2) Why does the brake controller cause a draw on the ignition circuit and not the brake controller circuit. It is plugged into the factory spot on the harness.

The alarm has been installed for over a year with no noticeable problems. The batteries were two years old "Gold" from AutoZone- supposedly the best ones they carry with 850 cca and 1000 something else - they were operating at 89% and 75% capacity as per the AutoZone tester. I warrantied them out and now have brand new batteries in the truck.

What I noticed to bring this to my attention- last week it was getting kind of cold; mid-20's to mid 30's. Two mornings in a row I had buttloads of white smoke out of the exhaust but no start. The remote start had to try two or three times to get the truck to fire; hence, the GPR replacement. One thing led to another and here I am.

Thanks in advance for any help guys.

Last edited by Mustangman6799; 11-05-2012 at 11:09 PM.
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