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Congratulations on the purchase.:beer: Be sure to give the brake system a thorough going over. It's great to go driving but even better to be able to stop.
Something you need to do also is remove this old switch. The reason for the change to the air switch was to remove the old style switch which can rupture and cause a loss of brakes.
Pretty much nature of the beast. When I was a mechanic at a construction company all the Mack dumps had the top loader double reduction third members like the deuce and always had that whine at road speed while the trucks like the GMC's and Pete's with the single ratio hypoid third members...
Having the 24 volt side grounded to either the battery or chassis is ok because the negative battery cable goes to a bolt on the frame for ground anyway. It sounds like the problem is with the ground potential. There are 2 basic ways to change from a higher voltage (24volts) down to a lower...
The easiest way to check for air at the switch is to build up air pressure. Shut down engine. Remove dummy cover from trailer supply glad hand. Make sure that the valve for the trailer service air is open and go back in the cab and depress the brake pedal. If you hear the sound of air escaping...
If it where me and have the funds I would replace with new. One very, very, very important thing to be very careful of is not to let any gasket sealant / RTV in the oil supply passage in the compressor mount or gasket...
Make sure the instructor has the manual pages and illustrations for the work they are doing because these are different from regular civvy truck axles they are use to. Be sure that you have new copper washers for the banjo bolts that connect the brake hoses to the wheel cylinders. Be sure the...