ID #1207


I have fitted a split charge diode and its not charging my batteries?

What you need to do, is acquire a standard 12volt relay which will have four terminals, two for the coil and two for the normally open switch contacts. You need to wire the relay so that the normally open contact terminals are wired are across the diode. One to the alternator terminal, and the other to the starter battery terminal. With the coil contacts, one needs to go to earth (negative) and the other needs to go to the wire that runs from the ignition switch to the starter motor which becomes live when you start the engine. Basically the second or two that you engage the starter is enough to kick your alternator in to life, by shorting out the diode.

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