What say guys…first post to this forum.
Wife’s 2001 Suburban 1500 4WD…Battery not Charging. Dash Voltmeter shows only 12 (battery voltage-no charge).
DVM confirms only actual battery voltage when running.
Took the battery and alternator into O’Reilly’s last Thursday and both checked out ok. Battery less than 2 years old. Alternator is original.
I put new battery bolts on.
Cleaned the battery bolt holes;
Cleaned alternator connections;
Cleaned remote positive connector;
Confirmed continuity between all connections between alternator and battery;
Confirmed continuity between small positive cable going to the electrical center;
Checked all grounds including back of block; blew out dust from PCM connectors;
After I did all that, started up and I got 14 volts but it randomly fluctuated between 14 and 12 every now and then.
Son took it to work Friday and said it stayed up at 14.
Wife took it to work Saturday and said it just stays at 12.
I decided to check the brown and gray wires on the alternator connector. Not sure what they’re for.
I think the gray is the “field sense” and brown is to the “PCM” ?
Key off, no voltage across either of them(to ground);
Key on, not running: Battery voltage =11.6v; Gray = 0; Brown = 9.98v
Engine running: Batt voltage = 11.4v; Gray = 0; Brown = 9.96 volts;
Any advice is appreciated. Can’t do with out the 'burb for very long and a new alternator is $150 !!
Shade Tree Steve