This charger is rated at 40 amps charging, 225 amp start at 7.2vdc for 7 seconds on, then 100seconds off.Ĭan anyone suggest an appropriate rectifier(or pair) that I can get from an electronics supply ? I don't know what kind of PIV rating or current rating I should be looking at for ordering a replacement. I have checked the rectifier assembly, and it is gone. This one has just the disc type diodes with the aluminum sheet for heat sink for a 'rectifier'. The transformer was still putting out, but nothing beyond the rectifier. They were quite common in auto battery chargers back thenĪfter doing some more checking, the charger ceased to produce any output to a battery. As least as long as the recitifier is a Selenium rectifier. However, accidently hitting the range button produced a strange discovery. So, I hooked up my trusty Extech 430 multimeter to the leads to see that there is absolutely no 6volt or 12 volt DC(actually extremely tiny and inconsistent bouncing. I am not afraid of soldering and reconnoitering- is there a chance I could source a substitute from digikey or the like ? What kind of numbers should I be seeing at the rectifier on this machine- ie voltage and AC or DC ?Ĭan anyone offer me any diagnostic procedures to execute from here ?įinally, if it turns out to be the rectifier, the OEM rectifier is long discontinued. What would cause a battery charger that takes in 120v AC and transforms it to 6 and 12 volt DC, to put out AC at the battery charger leads ? *6 Volt start-12 volt low(this is a combination setting) low puts out 12.9 volts AC output I figured I'd check to see if the ammeter had just given up the ghost. If you hook up the leads to a battery, the ammeter on the machine registers absolutely nothing. This one was made by Hitachi as best I can tell, for branding as a Craftsman/Sears. It is model 934718460 The settings are 6volt slow setting, 6volt fast setting which shares its position with 12 volt slow, then there is a 12 volt mediuim, and a 12 volt engine start. I have an older roll around Sears Automotive Battery Charger Engine Starter 6/12volt, 40amp with 225amp start feature.

Rectifier diode for battery charger