Advise needed wiring twin batteries in parrallel!

[Bulli]

Depends what alternator you have. Once you start putting additional loads on the charging circuit the alternators capacity can easily be overwhelmed. I have an 80 amp one but some 90 etc has much lower amp alternators. The efi system alone probably uses 10 amps , my electric fans about 20. Add a few lights then spots/ cb/ fridge/ stereo and suddelny you are taking more out than is being produced. Start winching at night if you want to see what your car is capable of!

[petergalileo]

Yes but just putting an extra battery wouldn't affect the alternator would it ? Adding a winch or extra lights would require more from the alternator.

I think theres a chap on ebay selling 120amp alternators for about £80 at the minute by the way.

[Bulli]

Thats a good price, one of the guys in our club has just fitted a 140 amp from the states....thats got some ummph. No it wont make a difference to what the alternator does but having the extra battery means you have twice the reserve power(assuming the batts are the same)