Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Alternator Reading!


aedgarg's Avatar
Visiting Guest

Posts: n/a

06-17-04, 01:32 PM   #1  
aedgarg
Alternator Reading!

Thanks in advance for your help. I have a 99 f 150 truck 5.4lt v8 ford. For awhile my battery indicator (red image of battery) would come off and on. I took my vehicle to the nearest dealer two hours away. $685.00 dollars later the light continued to come on. I was told a load test was done and that the battery was good. A day later my truck surged the all electrical was lost. The batteries "eye" was red so i replaced it with a new one. Two days later, today, it lost all charge as i was driving home. I have a reading of 10 volts at the posts, (after i had let the car sit for ten minutes). What is the reading that i should have at the Alt. when i start the vehicle, or is there another area to check?

 
Sponsored Links
davo's Avatar
Member

Join Date: Apr 2002
Posts: 2,417

06-17-04, 03:56 PM   #2  
With the truck running you should read between 13.5 and 14.7 volts measured across the battery terminals.What pray God did they charge $685 for?I think those folks would be getting a phone call if it were me.If the voltage is not within those specs it's not charging which I suspect due to the symptoms you have mentioned.You may have a wiring problem causing this but I would not let that dealer off the hook after that amount of money.You paid them for diagnosis and repair and got nothing in return.

 
Search this Thread