Hi, Im not too sure what I'll need. Ive added a second battery and alternator to my car. I want a relay to be turned on by the ignition, to switch on the charge/excite circuit of the alternator. At the moment the excite circuit is coming straight off the ignition, with a charge light. But this is…

Relay or Mosfet as switch.

goofballtech September 16, 2012, 7:17pm 2

Why not just get a diode isolator and let one alternator charge both batteries?

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