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73-87 Chevy _ GMC Trucks => Performance => Topic started by: rroeder96 on October 30, 2010, 02:01:21 PM

Title: charging problems
Post by: rroeder96 on October 30, 2010, 02:01:21 PM

ok hers's the problem i put a new alternator and battery on the truck and im still not able to hold charge can anybody figure out what the problem is. If the truck sits for about 30 minutes it goes dead again if anybody can help i would love the imput. Thanks

Title: Re: charging problems
Post by: VileZambonie on October 30, 2010, 02:46:23 PM

What's the charging system output?

Title: Re: charging problems
Post by: rroeder96 on October 30, 2010, 03:01:42 PM

im sure ive not had time to check cause i had to leave for work. What should it be up to while the truck is running..thanks

Title: Re: charging problems
Post by: VileZambonie on October 30, 2010, 03:02:45 PM

Run it at about 2,000 RPM with the headlights on. You should have at least 13.5Volts or higher

Title: Re: charging problems
Post by: xCaliC10x on October 30, 2010, 06:29:37 PM

So after 30 minuets of sitting, the battery is dead? I would say you have one huge parasitic draw. It should be easy to find if its that big.

Title: Re: charging problems
Post by: rroeder96 on October 30, 2010, 09:11:51 PM

ok i left the charger on for 6 hours at 2amps and truck started fine ill let it sit for a while and see what happens if it dies again do you think i have a wire grounding out some where and if so is there a easy way to find it thanks...

Title: Re: charging problems
Post by: VileZambonie on October 30, 2010, 10:39:19 PM

One step at a time. Instead of guessing check the output voltage to make sure it's charging. If it is the next thing to do is check for a parasitic draw.

Title: Re: charging problems
Post by: rroeder96 on October 31, 2010, 02:23:44 PM

ok i found the problem today come to find out the hood was hitting the new battery so problem solved thanks everybody...

Title: Re: charging problems
Post by: xCaliC10x on October 31, 2010, 03:25:51 PM

yup, a dead short, thats a parasitic draw.... of sorts.....

Title: Re: charging problems
Post by: rroeder96 on October 31, 2010, 03:56:30 PM

so i figured quick fix change the battery and be done thanks for all the help...

Title: Re: charging problems
Post by: Lt.Del on October 31, 2010, 11:01:47 PM

Holy sparks, batman!

Title: Re: charging problems
Post by: Irish_Alley on November 01, 2010, 12:35:55 AM

so you had a top post battery. was the hood getting hot

Title: Re: charging problems
Post by: rroeder96 on November 01, 2010, 02:00:21 PM

no the hood never got hot but that was the only thing i changed from being able to make contact with anything i put a piece of rubber mat on the battery and truck worked fine so i assumed that was it but if there are anymore ideas i welcome them all thanks for the help....

Title: Re: charging problems
Post by: Irish_Alley on November 01, 2010, 04:31:21 PM

Do you have insulation on the top part of the hood if not any Burnt part of the hood from making contact. Is it top post?

Title: Re: charging problems
Post by: rroeder96 on November 01, 2010, 07:34:40 PM

its top post and it has no burnt spots under the hood and no insalation...

Title: Re: charging problems
Post by: Irish_Alley on November 02, 2010, 02:12:46 AM

Could it just be a poor connection if the battery was to ground out when the truck was running i.e. battery touching the hood it would kill the engine imidiatly due to not enough power getting to the coil. So I don’t think that’s the problem I would be looking into poor connections