Electric problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crazyjim · 04-16-2016, 10:30 AM

I put a new battery in when I bought the truck, work fine till lately. I changed bad fuse now battery drains all the juice out of the battery when it sets over night cant figure it out.

chrismoore701 · 04-16-2016, 10:34 AM

Turn the lights out in garage. Pull battery cable off. Touch it to the battery. If it sparks you have a load. Pull the fuses out one by one and Check the spark on the battery. Do this until no spark. That circuit has your draw

**hatzie** · 04-16-2016, 10:36 AM

I usually pull all the fuses and put em back in one at a time... Easier to keep track of which ones you haven't tested yet.

I also usually use a meter between the battery and the ground cable. Use the 10A fused test lead port on the meter. Set it for DC Amps. A reading over 0.025 Amps (25 ma) is way too much. On these trucks background draw should be closer to 10ma or even less.

http://www.wikihow.com/Find-a-Parasitic-Battery-Drain

nonstop · 04-16-2016, 10:50 AM

What does the bad fuse control? Something caused it to blow. Pull out the fuse you replaced and leave it empty. If the battery stops draining, then you now know where you need to start looking.

crazyjim · 04-16-2016, 11:25 AM

Quote:

Originally Posted by nonstop

What does the bad fuse control? Something caused it to blow. Pull out the fuse you replaced and leave it empty. If the battery stops draining, then you now know where you need to start looking.

Tail lights.

nonstop · 04-16-2016, 11:37 AM

That's the circuit I would start checking out first.

**hatzie** · 04-16-2016, 11:43 AM

What's the fuse marked?
What year is your truck?
Depending on the year there can be a fuse for the running lamps and a different fuse for the brake lamp circuit. Several other circuits share those fuses depending on what year you have.

crazyjim · 04-17-2016, 11:08 AM

Found the problem it was the blower resistor on the heater I want to thank every body for their help Jim.

Pontiac1976 · 04-17-2016, 11:39 AM

Good find, glad you got it working. Thanks for let ever one know the fix.

04-16-2016, 10:30 AM	#1
crazyjim Registered User Join Date: Sep 2014 Location: The Dalles OR Posts: 123	Electric problem I put a new battery in when I bought the truck, work fine till lately. I changed bad fuse now battery drains all the juice out of the battery when it sets over night cant figure it out.

04-16-2016, 10:34 AM	#2
chrismoore701 Registered User Join Date: Dec 2004 Location: Highland, IN Posts: 2,326	Re: Electric problem Turn the lights out in garage. Pull battery cable off. Touch it to the battery. If it sparks you have a load. Pull the fuses out one by one and Check the spark on the battery. Do this until no spark. That circuit has your draw __________________ Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE

04-16-2016, 10:36 AM	#3
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Electric problem I usually pull all the fuses and put em back in one at a time... Easier to keep track of which ones you haven't tested yet. I also usually use a meter between the battery and the ground cable. Use the 10A fused test lead port on the meter. Set it for DC Amps. A reading over 0.025 Amps (25 ma) is way too much. On these trucks background draw should be closer to 10ma or even less. http://www.wikihow.com/Find-a-Parasitic-Battery-Drain __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 04-16-2016 at 10:48 AM.

04-16-2016, 10:50 AM	#4
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: Electric problem What does the bad fuse control? Something caused it to blow. Pull out the fuse you replaced and leave it empty. If the battery stops draining, then you now know where you need to start looking.

04-16-2016, 11:37 AM	#6
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: Electric problem That's the circuit I would start checking out first.

04-16-2016, 11:43 AM	#7
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Electric problem What's the fuse marked? What year is your truck? Depending on the year there can be a fuse for the running lamps and a different fuse for the brake lamp circuit. Several other circuits share those fuses depending on what year you have. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

04-17-2016, 11:08 AM	#8
crazyjim Registered User Join Date: Sep 2014 Location: The Dalles OR Posts: 123	Re: Electric problem Found the problem it was the blower resistor on the heater I want to thank every body for their help Jim.

04-17-2016, 11:39 AM	#9
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 766	Re: Electric problem Good find, glad you got it working. Thanks for let ever one know the fix. __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.



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