Schumacher ss-51a-pe battery charger with no output.

Get someone who works with electrics regularly to test the output on the cables with a voltmeter or a multimeter set to volts. They will be able to tell you which is which. Don't use the charger until you've found out which is which as this could do serious damage to the vehicle or the charger.

Manual

https://www.manualslib.com/manual/262015/Schumacher-Electric-Se-4225.html#manual

There is no Service Manual. The inside of the unit is very basic, one very large transformer and rectifier and a couple of knobs and a meter!

https://www.google.com/search?q=schumacher+se4225+service+manual+pdf

..

Akun aku tetku ci bos

Get a volt meter and hook up the test probes to the cable ends and turn the meter on, the meter will say 12 or -12 if it says 12 then you have the red and black from the meter connected to the red and black on the charger in the right manner, if it says -12 then you have them reversed. Take the cable clamps and put them back on.

Maybe this page will help, you have to download the manual.

http://www.manualslib.com/manual/149479/Schumacher-Dy-1420.html

thanks just what i needed 2 know

use a voltmeter. turn on unit to a low setting, place volt meter leads on broken wires one on each. if the voltage goes positive on meter. the positive clamp goes on the wire that the positive(red) voltmeter lead is on and the same for the negative.
Good luck

If a battery is defective, it will not accept a charge and it is not the fault of the charger. When connected and switched on, with the clamps making solid contact, the amp meter should give you a reading, depending on the state of the battery. To do a quick test on the charger, try it across a headlamp bulb, The bulb should light and the amp meter should read about 5 amps.

Quite simply - the unit has suffered component failure - most likely more than one. Capacitors are the usual source of noisy 'bang' or 'pop' sounds, followed by diodes and bridge rectifiers. If you have some knowledge of electronics, you can attempt repair, but, if none, I suggest leaving possible repairs to someone who does.
The humming sound you hear is the transformer under stress, and, if left connected, it too will die.

You are charging. The meter corresponds to the level of charge in the battery. Try setting to 10 A for 4 hours, battery should be half-way up. To determine if battery id dead.. leave battery off charger once it is fully charged...test with a voltmeter after 10 min.....battery should still be above 12v...after1 hour it should still be above 12v...if not battery is spent.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_aad3edb7dfa380b9