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not chargeing ligts on

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New User

Dec 8, 2009, 7:47 PM

Post #1 of 4 (1834 views)
not chargeing ligts on Sign In

i own an 84 chevy c10 pickup.and you can drive the truck anywhere long as you dont turn on the lights.replaced the alternator and battery and it is still not chargeing with the lights on


Dec 8, 2009, 7:52 PM

Post #2 of 4 (1829 views)
Re: not chargeing ligts on Sign In

New alternator could be bad. "new means nothing nowdays".
put a meter on it.

Check your ground cable to the truck, also.
check for "fraid" battery cables.
1984: 30 year old copper wire loses it's ability to conduct electricity.

New User

Dec 9, 2009, 8:26 AM

Post #3 of 4 (1818 views)
Re: not chargeing ligts on Sign In

thanks for the help but i have another problem is a 65amp alternator enough for this truck

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Dec 9, 2009, 6:16 PM

Post #4 of 4 (1814 views)
Re: not chargeing ligts on Sign In

trucker; Agree with Ratrace; What kind of voltage are you seeing at idle and at 2500rpm? The voltage regulator is built into the alternator. A 65A alternator should be sufficient. Did you replace the battery and alternator for this same problem? Most people will have access to a voltmeter, but few to an ampmeter. If the battery is low, the alternator will pump out amperage to try and recharge. As it is doing this, the voltage will be lower than normal. Once the battery is fully charged (assuming it is good), the amp output will lower and the voltage come back into specs. 13.6-14.6V. Before you get started, take a voltage reading at the battery. Then, start the engine and note the voltage readings. Repost these readings, if you will. Also, make sure that you have at least 12V to the power terminal on the alternator.
SW Washington

(This post was edited by Loren Champlain Sr on Dec 9, 2009, 6:18 PM)

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