Does anyone have a guide from a service manual or any troubleshooting procedures for the motor and parts inside the assembly itself? i have 12VDC at the white wire and ground is good ? I can see arcing at one of the relays but not sure if there are checks i can do on the motor or anything else in the whole assembly. The gearing looks to be in good shape and i really don't want to shell out $300.00 cnd for a rebuilt one, any help would be appreciated thanks !!