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Old 07-07-2014, 07:33 AM
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How to check batteries (dual battery setup)

Hey guys having a little bit of an issue I need some help with. So the truck sat for a couple of weeks while I was doing a bunch of maintenance to it. Got it working again just fine. Thing is now on cold starts it is running rough missing a bit till it warms up a bit. I think it is FICM or battery related though.

The batteries test out at 12.7 when fully charged. When they read 12.7 the truck starts just fine and FICM voltage stays between 46 and 48.5 while cranking or running.

When I let it sit overnight or for a day the voltage reads around 12.4 12.3 somewhere in there. When I start it then the ficm voltage will drop to around 40v and it does a lope like idle unless I give it fuel and get rpms up to about a 1000 then it runs fine. After a couple minutes ficm voltage returns to the rocksolid 47 or so.

I know it could be the ficm but was also thinking it could be because of a draw on the batteries while they are sitting. I dont know how to check for a draw on a dual battery setup. Do you disconnect one completely then do a single battery like you normally would?

Thanks for any help.
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Old 07-07-2014, 07:41 AM
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to check for draw u do it the same as a single but to load test u remove each battery from the system
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Old 07-07-2014, 07:42 AM
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ps u can run with one battery no problem just by unhooking it but starting can be a chore
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Old 07-07-2014, 08:40 AM
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your ficm is going out. it should never drop below 45 and even at 45 its probably going out. now i would also look at your alt. what is your battery volts while truck is running and glow plugs are off? what volts are you running while cranking. truck might start but i had my truck starting at around 9volts. that is not good for the truck especially the ficm
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Old 07-07-2014, 09:10 AM
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Ill check those different things guys. Thanks for the input. Was hoping it wasnt the ficm but imagine it should stay within spec even at 12v. Ill check to see what the draw is at starting and what not.

Probably just order a new ficm shell.
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