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GMC Forum: 04 gmc dreaded parasitic drain
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  #1  
Old 09-06-2018, 08:07 AM
alan alan is offline
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Angry 04 gmc dreaded parasitic drain

204 gmc sierra sle ext cab 5.3ltr 4wd.i used the test light from the battry post to the battery cable and it shows a drain.why wont the test light go out when i remove each fuse one at a time.shouldnt that isolate the bad circut?so i could chase it from there.did the fuse remove thing on both fuse blocks and the test light never went out.WTH?i have three positive battery cables.1 for the fuse block,one for the plow,one for the starter.the drain is on the one for the fuse block no other.ive looked for chaffed wires everywhere.under dash,under truck(i have a lift),under hood.i used a multimeter from pos.cable to pos terminal of battery and it says anywhere fron 5 to 7 volts draining?

Last edited by alan; 09-06-2018 at 08:15 AM.
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  #2  
Old 09-11-2018, 12:30 PM
oldfoggie oldfoggie is offline
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Quote:
Originally Posted by alan View Post
204 gmc sierra sle ext cab 5.3ltr 4wd.i used the test light from the battry post to the battery cable and it shows a drain.why wont the test light go out when i remove each fuse one at a time.shouldnt that isolate the bad circut?so i could chase it from there.did the fuse remove thing on both fuse blocks and the test light never went out.WTH?i have three positive battery cables.1 for the fuse block,one for the plow,one for the starter.the drain is on the one for the fuse block no other.ive looked for chaffed wires everywhere.under dash,under truck(i have a lift),under hood.i used a multimeter from pos.cable to pos terminal of battery and it says anywhere fron 5 to 7 volts draining?
clean the connections on that cable, on the wire and where they connect, I suspect this does not discharge the battery,
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Old 09-17-2018, 05:08 PM
alan alan is offline
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cleaned it up and redid 8 grounds and the same problem.the draw drops in half when i take out the radio fuse.
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Old 09-20-2018, 06:43 AM
oldfoggie oldfoggie is offline
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there should be no voltage drop from the battery post to the cable, if there is a drop that indicates a resistance in the cable, usually connections are the problem, the radio will draw current even when it is turned off, does this discharge the battery over a few days, if everything is working ok, I suspect that what you are seeing may be normal,
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