Originally Posted by silver G
Depends which vehicle you have. If your system is 12 volt then parallel.
Depending on the truck you could well have a 24 volt system
ie - alternator, glowplugs and lighting.
Having all your ancils running off a 12 volt system is probably best but you will have to work out how to charge it off 24 volts if that's the alternator you have.
I hate electrics BTW and still waiting for someone to explain why current doesn't flow out of the negative terminal
and I can live in peace with my battery change over switch
"Never have a stupid argument with an idiot - he gets a lot more practice than you"
there I go again
not too hard really