75HP Mariner/Mercury outboard trim sluggish going down intermittently then works fine

[PISTONESAL]

Anybody have any thoughts or ideas? I dropped boat in water this past weekend and the engine trimmed down very slowly. I thought oh no a bad battery bt wasnt as engine started right up. Then it started to trim just fine. Anybody got any thought or ideas what maybe happening. it did sit for a few weeks without use before this past weekend. I appreciate it. Thanks

 

[merc850]

Maybe the leads to the battery are corroded on the bolts (the - lead is a likely choice) or the ground lead to the pump motor is. When you started the motor it broke thru the corrosion.

 

[tommarvin]

I'm going with merc 850, its corrosion in the wire connector and the connectors about to fall off., clean all electrical contacts shiny
It could be a relay/solenoid failing but it.s probably not.but if this happens again after cleaning all contacts maybe.