Posted by George Marsh on October 13, 2011 at 07:21:05 from (64.12.116.74):
In Reply to: battery charger??? posted by dave2 on October 13, 2011 at 04:41:21:
Dave, Open up your smart charger and follow the power wire, usually the black wire, It will go to a relay that the brain box will turn on and off. You will see another power wire leaving the relay and going to the primary of the transformer. In your case this wire may go to your 6v -12v switch before it gets to the transformer.
There is more than one way to do this. You can install a SPDT switch to convert your charger to a manual charger/auto charger. All you have to do is have the power by-pass the relay and go directly to the transformer.
I recently worked on a golf-cart charger that the brain box was fried because of a power surge. I removed the power in wire and power out wire from the relay. Usually these wires are connected to the relay with slip on connectors. I Jumped these two wires together by using a large flat style 20 amp car fuse. Wrapped tape around the fuse and connectors. This turns the charger into a manual charger. Neighbor was happy getting his charger fixed for free. Told him to put the charger on a timer so he doesn't forget to turn it off and fry his batteries.
All smart battery charges are nothing more than an old style charger with an added brain box. George
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