XtributeX

I have a new battery and a new alternator both checked and are working perfectly fine, However it still seems like when I am running with any load the 130 amp alternator cant keep up... help!

Will

2003XLT

Make sure your ground is clean and free of corrosion

njoffroader

what is the alternator charging battery at?

XtributeX

it seems like there is nearly no connection between the two. Like there is a break in the line somewhere. I am going to clean up all the connections today and hope it fixes all my issues... I am plugging in my F150 every night... boo

Will

2003XLT

Do you have a volt meter? If you do with the truck running see if the alternator is charging the battery.

XtributeX

The alternator is not charging the battery. However it is functioning properly. I have narrowed it down to there is a connection break between the alternator and the battery.

Will

XtributeX

The alternator was charging at 10.25 volts. I cleaned some terminals and now its at 11.74 volts but the alternator is still not keeping up with demands... I am going to check for voltage drop in the charging cables next.

tansupercrew

You the say the alternator is charging at 10volts but it is functioning properly? With a new alternator it should be charging at least 13.5 volts. Don't assume because it is new that it works. Put a voltmeter on your battery and have someone start it. It should measure 12.5 before and should not drop below 9 while starting and should immediately hop back to 12.5 - that rules out the battery.

2003XLT

12.5 volts in low for the truck running you wanna see high 13's 13.7,8,9 your alternator sounds like the voltage regulator is junk brother get a new alternator

XtributeX

they bench tested the alternator at napa and gave it a 100% passing grade. I am assuming they dont test the alternator voltage regulator?

Will