I have an intermittant problem with my Horizon 500 winch on a Mako293. I have sleuthed it with a multimeter to the control box (located in a nearly impossible upside down position in the chain locker). Seems like one of the relays is being intermittant. I would like to try a replacement or some way to test the relay in site. Anybody know where I can find a relay or how to test it?