Nite,

This truck has a SPED wiring harness. This states that the customer requested additional changes to be added to the lift, like flashing light. Do you have two flashing lights up front or just one? The wire harness shows a forward relay, CRS310 that supplies power to the flashing lights on wire 720, through fuse 1 which is 5 amps. Verify fuse is good or install new. Make sure you are getting voltage across fuse when moving forward. You may need an extra set of hands. If voltage is getting across the fuse you have a connection problem from fuse to lights. If now power, you have a relay problem or wire to replay has failed. CRS 311 is a motion relay that supplies power to CRS310 at pin 30. Since one is a motion relay and the other is a forward relay, all checks need to be completed with lift in forward travel. You may want to put the lift on blocks. Good Luck.