I have a jump box that uses a 18v DC 500ma walwart .. I fired it by hooking it up to another jump box in order to charge it but didn't realize it needed 4amps vs 500ma so its fried .. But I am rebuilding the circuit and its really simply cause it has a step down transformer to a bridge recifer and then right to the jump box with a filter cap on the output.. But question is what limits the current cause I started using my power supply and the box will take 3 amps but the charging circuit gets pretty hot???
Thanks
Jay Sr
Thanks
Jay Sr