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Mercury Classic 50 Trim Problems. Help with Part #

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Acleme2017

New member
Hello all. Pulled my Tracker out of storage recently and was ready to get out on the lake this evening. When I connected the batteries, the trim went straight up as soon as the wires hit the battery terminal. Went all the way up and tried to keep going. The switch at the back of the boat worked to trim it back down. It would pause for a few seconds, and then trim itself all the way back up. Frustrating! I went through the switches and they are fine. There are 3 switches: bow, stern and in the throttle handle. When the motor pauses, there is an electrical "sound" coming from below the motor cowl. From what I've read, it sounds like a bad relay. I've tried searching manuals for a part number, but I can't find the relays for the trim. My boat is a Mercury classic 50 (45hp), and the serial number is 0B161091. Can anyone help me out with a part number for both relays? I figure I'll just replace both the up and down relays while I'm in there. Any help would be greatly appreciated!

And if you think you may know what's going on with the trim that isn't the relays, I'd love to hear that too.

Thanks!!
 
Disconnect one of the small wires (ground or power) from the relay and see if it doesn't trim up, put a VOM meter across the + lead and ground and see if it has 12+volts - if so there might be a short in the wiring harness or the switch is shorted.
If it still auto trims disconnect a wire from a big terminal and see if it stops this would mean the relay is welded closed.
 
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