Today I measured the battery voltage to see if the alternator was doing ok. Here is how my test came out.

With the car not running the battery voltage is about 12.5 volts.

Start the car and at idle the voltage goes to about 12.75 for the first three minutes (my glow plug relay has the three minute afterglow feature)

After three minutes the battery voltage jumps up to about 13.71 volts at idle

My thoughts are the alternator and voltage regulator are ok....

What does the forum think?

Many thanks,

Glenn

__________________
2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)