Brake Lock Input The brake lock is used to lock only the rear wheels during loading. This allows the front wheels to rotate slightly and allows the payload meter to more accurately estimate payload. It is very important that only the brake lock be used during loading. Using the service brakes will significantly decrease payload meter accuracy. The brake lock connects circuit 39H to ground. The circuit is wired through a small black connector behind the dash panel. Confirm that the warning light panel indicates that the brake lock is recognized by the other truck systems. If so, fol- low the signal from the switch to the payload meter.
It may also be that the connector on the back of the payload meter needs to be disconnected and re-inserted to clean the contacts. M20-50 Payload Meter II™ Troubleshooting M20007.2 3/02