Volvo Penta D3-130A Operator's Manual page 68

Maintenance: Electrical system
66
4. There must be a main switch connected to the
starter battery positive (+) terminal. The main
switch should cut off power to all power consuming
equipment and should be switched off when the
boat is not in use.
5. If an auxiliary battery is in use, a main switch
should be connected between its + terminal and the
fuse block, and the (–) terminal and the terminal
block for the boat's electrical equipment. The main
switch for the auxiliary battery must cut off all pow-
er consuming equipment connected to that battery
and be turned off when power is no longer needed.
All equipment connected to the auxiliary battery
should have separate switches.
To simultaneously charge two independent battery
circuits, fit a suitable model of Volvo Penta charge
distributor (accessory) to the regular alternator.