New altinator and battery - still having problems.

[lovemytruck2009]

After battling with an old altinator/new battery ...... new altinator/old battery.... NEW alt/NEW battery.. the battery is still not holding a charge. Alt belt is not too tight or too loose. Please help.

[fourwd1]

Maybe the problem is not the battery or alternator, but some parasitic load is draining the battery when the engine is off.
Connect an ammeter in series with the battery, and with everything OFF, the current drain on the battery should be maybe 50 milliAmps (.050 Amps) or so from stereo, clock, ECM, etc. If it's a lot more start pulling fuses to isolate the problem circuit, then troubleshoot from there.

[Supra469]

Originally Posted by fourwd1

Maybe the problem is not the battery or alternator, but some parasitic load is draining the battery when the engine is off.
Connect an ammeter in series with the battery, and with everything OFF, the current drain on the battery should be maybe 50 milliAmps (.050 Amps) or so from stereo, clock, ECM, etc. If it's a lot more start pulling fuses to isolate the problem circuit, then troubleshoot from there.

Thanks for that good bit of advice.

[fourwd1]

Originally Posted by Supra469

Thanks for that good bit of advice.

Any time