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Complicated parasitic drain

parasitic drain on multiple circuits

Complicated parasitic drain

Postby underthesea55 [OP] » Mar 24 2013, 3:05am

I have had a small (approx 60 milli amps) parasitic drain on the 'radio' circuit for a while and after a halfd assed attempt, I found nothing. Not a big deal as my truck is driven lots and if left for the weekend would still start fine. That has now changed and after a more thorough dignosis I've found a few more drains. I haven't found many wiring diagrams and the ones I have found are for individual circuits so Im having a tough time finding a common fault for all these problems. There is an aftermarket remote starter but no obvious wiring defects, what I can see under the dash looks and tests ok ( no open circuits). Everything else electrical is stock and I haven't touched it.

So far I've checked the under hood fuse block and found:

IGN A (40A fuse) - 47 m/a draw
IPC/DIC (10A fuse) - 150 m/a "
Radio (15A fuse) - 620 m/a "
HVAC (10A fuse) - 40 m/a "
AUX Power (20A fuse) - 35 m/a "
LBEC 2 (50A fuse) - 70 m/a "
TBC Batt - 60 m/a "


This was done about 30 minutes after the battery was disconnected with the doors all closed, key out ect...

Anyone have similar problems or smart enough to hopefully find a common point between these circuits? I think I'll have to brung it into a shop but I know how expensive diagnostics can get with no reswults. Thanks for the help!
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Re: Complicated parasitic drain

Postby Joseph » Mar 24 2013, 6:21am

You need to check around and see what the normal amperage draw is while the Truck is off and all doors closed. Most of the amperage draw you posted on each circuit probably has to do with memory settings. If power is lost the memory settings will be lost like the clock and your settings for HVAC if you have the digital display.
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Re: Complicated parasitic drain

Postby underthesea55 [OP] » Mar 29 2013, 6:51pm

It should be no more than 50 milli amps, I made sure I left all doors closed, key out and everything shut off as though the truck were parked overnight or while I was away. Without touching anything I did the test so as to keep all things 'asleep'.
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Re: Complicated parasitic drain

Postby Crabman » Mar 29 2013, 9:03pm

I had a drain in the instrament cluster that would kill the battery in 2-3 days if truck was not driven. Pull out that fuse and it would not die. I had the cluster rebuilt and good to go..... also on a 04 1500.
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Re: Complicated parasitic drain

Postby ThomasG » Mar 29 2013, 9:57pm

Have you disconnected the remote start for a try? Would be my best bet. If it keeps other modules from "going to sleep" since it is probably on the communication bus, you have all kinds of small draws that add up to a big one.
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