Join Date: Jan 2012
Location: Trevor, WI
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Alternator not charging for a bit at startup.
I have an 00 Excursion. Recently noticed that the battery voltmeter on my Edge programmer was showing 11.7 volts when the truck is first started. After 30 seconds to a minute, the volts jump up to 14.3 and stay steady there.
Measuring at the batteries, I was getting about 12.5 volts (after the truck sat for a few days) before starting. When I started it, the volts measured about 12.0 for 30 sec to a minute. Then jumped up to 13.6-14.5.
I replaced the alternator tonight. No change in output.
Coincidentally, I noticed all of this about a day after I jump started my lawn tractor battery with the truck.
I just disconnected the battery cables. My plan is to check for a voltage drop in the batteries overnight. Also in the morning am going to load test each battery. I believe the (Motorcraft) batteries are about 2 years old.
Any ideas or directions.