[T2] Alternator charging?

[Mike Benthin]

20 minutes may just be enough to fully top up a battery you used to 
start it, definitely not if you stop and start along the way.  Get a 
smart charger (3 stage, it will go to standby when battery is fully 
charged).
A fully charged good battery just off a full charge will be 13.2v (2.2 
per cell) max.  A resting battery, post charge, with no current draw, 
will be 12.7 after 2 hrs or so.  Your voltmeter is suspec; they tend to 
read high if they need new batteries.  You should see some rise in 
voltage after you turn on the bus if alternator is working.  Dirty way, 
turn on lights and start it, they should brighten up. Get a hydrometer 
and measure the actual specific gravity of each cell, it is the most 
accurate way to determine current state of battery.

MUTS Oboe/EH support = Michael's Ultimate Thumb Saver
93 Chevy Roadtrek 210P
78 VW Westfalia Camper