Question about 2004 Chevrolet Silverado 2500HD

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I have a 03 chevy 2500HD the amps and rpms go down when putting drive and reverse and pulling out from a stop. Battery went bad changed it now this problem started thanks a little puzzled

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First, make certain that the battery you replaced is fully charged and that cable connectors are clean and wires are in good condition. Sometimes after sitting on a shelf , they aren't fully charged when you buy them. Your alternator can never charge the battery, it's designed to maintain the state of charge. You may be used to seeing readings that reflect your charging systems efforts to keep a failing battery charged. Those readings are not normal.
Your charging rate does change with engine rpm's up to a point...then the regulator takes over. Rpm's generally do drop a bit when in gear, and obviously change when accelerating from a stop. All your instruments are actually volt meters with different scales on them all rely upon actual line voltage to operate and though this is not as noticable as at a volt meter or amp meter, there subtle changes in all readings. Providing that you are getting proper voltage at the battery (generally 13.5-14.0 volts at the battery with engine running with accessories on) I would not worry about it. You can get your charging system tested at most larger parts stores free.
This isn't a fix, but rather an explanation as to what you may be seeing. If within normal range it's OK.

Posted on Jul 31, 2009


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