I fitted one of National Lunas' "Battery Management Systems" to my Defender. Fairly easy though a bit fiddly. It charges the main battery for the first 4 minutes (you can change this setting) before you hear the solonoid click and the charge is routed to both batterys.
The "monitor" (LED bars) unit fits perfectly onto the bulkhead to the right of the fusebox on a Defender. An squealing alarm (you can turn this off) reminds you if you've left any drain on batterys.
Very pleased with it. Imported from SA at considerable saving. You need to phone them though as they don't reply to emails and customer service is somewhat lacking . . . .
Huey
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