I have a 03 gmc.6.0 replaced batt. after checking charg with vat 40. alt. is...

S

Sam H

Rookie
...good still get dim lights at idle Amp. ga. goes to 9-10 then works back to 14 + When under accelleration charging is 14. Heater is on, radio on, lights on, ocasionaly have heater on driver seat for a few minutes, Purchased a 875cca. batt. on sat. 12/8/07 with dual posts. Mounts with side posts which are clean. Does not draw down at any other time. Never noticed dimming in previos years.
 
G

greenvetter

Rookie
What you are calling the Amp gauge is a voltage gauge. If it is dipping down to 9 and then coming up to 14 you either have something loading the system or your alternator is not putting enough current/voltage at idle. Put a voltmeter across the battery terminals or put a current clamp on the battery lead to see if this is true.
 
G

greenvetter

Rookie
What you are calling the Amp gauge is a voltage gauge. If it is dipping down to 9 and then coming up to 14 you either have something loading the system or your alternator is not putting enough current/voltage at idle. Put a voltmeter across the battery terminals or put a current clamp on the battery lead to see if this is true.
 
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