This Schumacher 1042A-PE battery charger stopped functioning today. It seemed to work for a little while but when I noticed the car battery's voltage wasn't slowly increasing after performing a 2 amp charge for 2 hours, I checked the voltage at the charger's cables and it was 0 volts. The continuity of the switches and cables were all good. I did find a power semiconductor which I could not identify, BTW70-200SN. I looked in an old ECG cross-reference book and the closest match was for a BTW69-800 which is an SCR in a TO-218 package. The package seems to match the device I'm looking for. I made some measurements with my Simpson 464 DVM on the 2k ohm scale. Pins 1 and 3 measure 38 ohms regardless of test lead polarity. All other combinations of continuity measure open circuit. In circuit, pins 1 and 2 are soldered together. Any idea what this component is or how to test it?
Thanks for your reply.
David Farber Los Osos, CA