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I have done this before, put about a 10 amp charger on the battery. Pull the courtesy light fuse first. Look at the battery charger, it is probably charging several amps, pull one fuse at a time. When the charging amps drops down you found the fuse the controls the problem. I had a car several years ago that someone pulled the seat belt all the way out, somehow it was pulling a load and draining the battery overnight.
You just need to set black & decker charger to 12V . Don't make mistake while connecting + / - leads. + lead usually come with Red color cable. You can use the AVO tester to justify the lead cable. The charging time is normally about 10 -12 hours (or just just check the status on your charger display). If your charger does not has trickle charge facility, you have to disconnect your charger after 12 hours continuous use.
Also, you can find the guidance about your charger here :
A battery that might sit for a month at a time, would only need a trickle charge or about 1 amp, a charger of this type can stay hooked to the battery for the whole month. A 10 amp would be for a quick charge or only about 4 - 12 hours depends on how fast the battery lost the charge. A 10 amp charge would cook the battery if left for days.
The 2 amp setting is a trickle charge, use this if you're going to let the battery charge overnight. The 6 amp is a little faster, anywhere from 4 to 8 hours depending on how low your battery is. Be careful not to overcharge if your charger does not have an automatic shutoff.
thats what i did on mine they blew when i hooked the cables up backwards (gotta watch that)
but i used 130 amp alt diodes from an old tractor alt i had
NEVER connect positive to negative. You'll damage your electrical system in the car or fry the charger.
It is best to put the positive on first, and then the negative. Remember, it doesn't always have to be the negative post of the battery, it can be a really good ground on the bare metal of your car.
But sparks just go along with it - don't let them scare you. But I always connect the clamps first, then turn on the charger, with the dial on "off". Then make sure of the 6/12 volt settings, and the amp charge you want to put on. A long slow charge overnight fo 12 volt can be 10 amps. A relatively fast is 50. And then to jump it off, go to the setting.
Make sure the battery being charged is sitting in wood, not concrete. If you have the old fashioned battery with removeble water caps, don't breathe the vapors.
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