Load Bearing Member
Join Date: Sep 2011
Location: Derry, NH
Thanked 14 Times in 12 Posts
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Re: 12volt charge
Using the cig lighter outlet is fine; as Gary says, it's just a connection to your battery.
One good reason not to set the selector to 'All' is if one batt has been drained and the other is topped up. When connected together, current will flow from the 'good' batt to the 'bad' one with no regulation. I'm not an expert, but I'd make sure they are within half a volt of each other, before you connect them. If it were me, I'd charge one batt one week and then the other for the next week and never connect them. I would only use 'All' if both batts are weak and you think together they might have enough juice to start the engine.
Imagine if you set the switch to 'All' and some fault in the system killed both batts while you're away.
Again, I'm not an expert.
When I set up my charger, I hook it right to the battery and leave the panel off. This eliminates any 'vampire' loads (like the panel 'ON' light) and reduces the risk of a fault draining the batt (and ruining it if you don't catch it in time).
1978 Bristol 29.9 #122
Testing a mother's love since 1962
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