Be very careful handling the alternator/generator because it can have a built-up current that can shock you under certain circumstances. Parts for that alternator/generator are no longer available and many of the parts are not serviceable by rebuilding. Only finding working units is how they can be repaired today. Through the years I purchased spares if mine needed servicing, and my 1969 had to be repaired twice when someone switched off the batteries before they turned the engine off. I rectified the problem the second time by bypassing the alternator switches and wiring the batteries directly into the car's charging system. I still have the parts listed in my eBay searches, however, I can't remember when the last time a part became available. Like so many of the parts that make up the Commercial Chassis cars are specific to the cars themselves, spares are seldom found.