electrical Archives

Thomas Rear Engine School Bus Electrical Troubleshooting

Electrical troubleshooting can be a breeze once you know the layout. It’s much like any blueprint that details the operating system. With this Thomas HDX rear engine pusher model the engineers were very kind developing an easy to use electrical circuit board system that offers the details of each board on the access door. I’m… Continue reading Thomas Rear Engine School Bus Electrical Troubleshooting

Troubleshooting Cummins ISB Diesel Engine Electrical Problems

One of our 2009 Cummins ISB diesel engines died on the road today. It doesn’t happen often but unfortunately on the way home the engine shut down like turning off the switch. Two mechanics went downtown to check it out and tried everything they could to get it going. Priming the fuel system didn’t make… Continue reading Troubleshooting Cummins ISB Diesel Engine Electrical Problems

Thomas School Bus Electrical Problem Circuit Board

I’ve seen a lot of electrical problems over the years and this one is the first with ghost voltage connecting to a relay for the running lights. As described in the video the printed circuit board has all of the fuses and relays mounted on it and connects everything with internal wiring circuits. The LED… Continue reading Thomas School Bus Electrical Problem Circuit Board

School Bus Electrical Fault

This is the first time I’ve ever seen a problem like this on an HDX pusher school bus model. The Thomas HDX pusher bus has printed circuit boards that relay all of the supply power to run the lights, heater motors and operating circuits. There are 3 circuit boards in total and troubleshooting requires a… Continue reading School Bus Electrical Fault

School Bus Module Corrosion

Modules have been part of the mechanical world for many years. The technology has advanced in leaps and bounds with more monitoring and control of multiple circuits reducing wiring, switches and connections. Most school bus modules are sealed from the environment however if moisture and oxygen are allowed to enter it’s inevitable a failure will… Continue reading School Bus Module Corrosion

School Bus Electrical Information

We recently found the problem with the no ignition power on one of our pusher school buses. The details leading up to the solution were documented in a previous post. The circuit board has definitely failed because of a bad diode internally that is allowing battery voltage to ground out. This is a dead short… Continue reading School Bus Electrical Information

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Tag: electrical