How do you start a CEN tech battery charger? The battery charger fully charges a 12v battery in only 6-8 hours. The compact unit is loaded with features, including long battery leads and power cord, charge indicator, self-resetting circuit breaker and an automatic trickle charge mode after your battery is fully charged. A successful repair.How long does a CEN tech battery charger take to charge? Everything looking good, and a significant drop in AC ripple as expected.

A final test is done under load charging a battery. Now at full voltage everything is re-tested and the unladen numbers look good. Everything looking good so all of the functions will be checked, along with the devices voltmeter. Testing will be done live with a Variac and isolation at low ac voltage. The housing were riveted, now secured with machine screws and nuts.Īfter testing, the whole diode board is reinstalled into the unit, all wires re-connected. All of the diodes are tested in the bag, finding the closest characteristics, then re-assembled into the housings. New diodes will be used all around, 10MM 50 Amp, I purchased from Power Forged PN 696040-10.

While epoxy dries in the recess on the housing from the melting. The plate is cleaned and the prepared for reassembly. The housing on the effected diode is melted requiring an minor repair. Damage is evident so the rivets are drilled out and the diode housing is removed. The entire Diode panel is remove from the unit. Setting the Fluke Meter to Diode, all rectifiers are tested, in both directions finding immediate issues, notably shorts found. With the rectifier disconnected the hum is gone and the fan spins at full voltage.Showing the problem is from the rectifiers back. Note that as I apply power at intervals its only for demonstration.

With the checking of switches, and resistance through the fan and coil. After which power off troubleshooting commences. This device is Harbor Freight number 63043.įor demonstrations of failure I will be using a Variac and an isolation transformer for safety. This device can be lethal so precautions should be taken. I will attempt to the greatest extent possible, troubleshoot without power. They Generally brake in the same fashion and can be repaired cheaply. Looking at a CEN-TECH heavy duty battery charger from the Bug ranch.

How to use cen tech battery charger