Any way to test the brake magnet circuits?
While replacing the bearings on my Pop-up, I discovered that one of the brake magnets was an open circuit and I only had one brake. The controller sensed the good circuit so it was happy. Since th...
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Sears used to sell a clamp on amp meter that detects DC amperage. Most all clamp on meters measure AC only, but this one is special. It is a reasonable price for a DC clamp on, about $90.
With this meter, you can clamp it over one of the brake wires and check each one by itself, or as stated above, clamp it on the main emergency box wire, pull the cable, and check the amperage to all 4 at once. If you get about 12 amps, then all 4 should be on. DO NOT leave them on for a long time (10 seconds), or you will have shorted coils. In normal use, the truck controller puts out only 4-9 volts and the coils will not get nearly as warm as applying the emergency 12 volts (or 14.5 volts if you are plugged into shore power) and there is no cooling air that normally happens while driving.
Fred.
With this meter, you can clamp it over one of the brake wires and check each one by itself, or as stated above, clamp it on the main emergency box wire, pull the cable, and check the amperage to all 4 at once. If you get about 12 amps, then all 4 should be on. DO NOT leave them on for a long time (10 seconds), or you will have shorted coils. In normal use, the truck controller puts out only 4-9 volts and the coils will not get nearly as warm as applying the emergency 12 volts (or 14.5 volts if you are plugged into shore power) and there is no cooling air that normally happens while driving.
Fred.
