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99 Silverado battery drain

battery drain, isolated to radio fuse

99 Silverado battery drain

Postby spacoli [OP] » Jan 12 2012, 2:16am

Hi to all, I'm new to the forum. I got to say the forum looks great and looking forward to spending some time here learning about my truck.

Some colder mornings the truck barely starts, so I started to test things out.

The battery is marked new in 2010 and has a good voltage reading (over 12.5). Alternator is charging it good.

I found that I have a .65 amp parasitic battery drain that I isolated to the radio fuse. When I pulled that fuse the drain dropped to below .2 (can't remember exact).
I pulled the radio and check again and had a .6 amp drain, so it's something else on that fuse.

I know the instrument cluster (warning lights,odometer, gauges) is also on that fuse. Is there any thing else on that fuse?

Does anyone have any ideas what to look for next? Is there something that has been a problem for the Silverado trucks that I may be able to look for?

Thanks
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Re: 99 Silverado battery drain

Postby ASTE25 » Jan 12 2012, 3:28am

I think you are going to have to get a wiring diagram to figure this one out. There are so many things that can cause electrical problems like yours. I'd get a good diagram and see what all it attached to that circuit. I'd unhook each one at a time until the drain went away. Then, starting with the first thing you unhooked, start plugging them back untill the drain is present again. You may well have more than one thing in that circuit causing the drain.
Jordan
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Re: 99 Silverado battery drain

Postby country1911 » Jan 12 2012, 3:33am

You don't have an aftermarket radio, subs and an amp do you? It could be the amp on all the time?

Sent from my Evo
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Re: 99 Silverado battery drain

Postby spacoli [OP] » Jan 12 2012, 3:42am

No amp, but I do have after market radio. I unplugged the radio and ruled that out.
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Re: 99 Silverado battery drain

Postby ASTE25 » Jan 12 2012, 3:47am

The best thing to do is get a wiring diagram and trace that circuit all the way out. There really is no easy way around it. Electrical problems are always a real PITA.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
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Re: 99 Silverado battery drain

Postby country1911 » Jan 12 2012, 3:53am

I agree with ASTE, the amp was the only easy thing I could think of. Good luck, you will need it.

Sent from my Evo
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Re: 99 Silverado battery drain

Postby spacoli [OP] » Jan 12 2012, 11:55am

Where can I get a wiring diagram? Hoping to get one online for free?
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Re: 99 Silverado battery drain

Postby ASTE25 » Jan 12 2012, 1:30pm

You can go to autozone.com and register and they have them available under their repair information tab.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
User avatar
ASTE25
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Re: 99 Silverado battery drain

Postby spacoli [OP] » Jan 12 2012, 11:10pm

Thanks for the Autozone link, I found them. Looks like I have my work cut out for me.
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Re: 99 Silverado battery drain

Postby ASTE25 » Jan 13 2012, 1:27am

Like I said, electrical problems are a PITA.
Jordan
2013 Blue Granite Metalic Silverado 2500HD Z71 4X4 extended cab regular bed
6.6L Duramax/Allison 6 speed
Line-X premium over the rail (black)
User avatar
ASTE25
Shifting into Sixth Gear! [L3]
Shifting into Sixth Gear! [L3]
Posts: 10900
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Images: 21
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Joined: Jan 03 2011, 6:37am
Years of membership: 3 years of membership3 years of membership3 years of membership
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Year: 2013
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Extra Info: 2500HD Z-71
Group Membership:
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