Ok one day my 99 k2500 suburban just all of sudden started losing electrical power while i was driving. i assu?

(2010-05-30 12:36:39)

1. dunni Says: ok one day my 99 k2500 suburban just all of sudden started losing electrical power while i was driving. i assumed alternator was going pad so replaced it. that didnt help. the voltage meter in my dashboard goes up to the normal 14 and then drops down while driving and keeps fluctuating back and forth with the battery light going off and on. i then replaced my belt and tensioner. the problem got a little better but then worse. i realized that if i put pressure on alternator one way it charges rite then put pressure the other way it dosnt. so i try to see it move while doing so but it doesnt. also while doing that my engine idles different one way and then another when i change where i out the pressure. well this has been a problem for a while now but just recently my battery has been dying while i have truk off and i make sure nothing is on. i just dont know what the prblem is or how else i could go about fixing it.

2. Rick E Says: not sure what you mean by "putting pressure" on the alternator
make sure the belt is the right size and the tensioner is not an aftermarket one.
It sure sounds like the alt is ok, but also be sure it has the required amps called for your application.

3. Vince C Says: battery, got a spare try it

4. LancerWay Says: Check the pig-tail connection for the field wire. It's the four pin connector that will have anywhere from one too four wires. They wear out from engine vibration and loose conatact. GM has replacement hraness connectors available.