Alpha One Trim Pump Works Then Doesnt

greg82255

Senior Chief Petty Officer
Joined
Oct 26, 2009
Messages
781
Hello,

1986 Merc 350/Alpha One. I believe the trim pump is the original oildyne version (SAE J1171 motor with the small black reservoir underneath). I always put the drive pretty much all the way up when the boat is docked. Yesterday I got to the dock and went to put it down and I just got a click from the pump. I pushed the down button a few times, all clicks, then I pushed the trailer button (b/c it was above the limit switch point) and got another click. I went to the pump and cleaned up all the connections and still got just a click for either direction. I then tried to jump the green wire to the positive terminal to get the drive down, and got nothing. I figured it was a bad motor.. I got mad and gave up for about 5 minutes and figured I'd try jumping the green wire one more time and it all of a sudden worked. Then I pushed the up and down button to see if it would work, and it did.
The same thing actually happened to me last week but I figured it wasn't a big deal, but since it happened again, I figured I would ask the experts. Anyone know what is causing the motor to work sometimes and not others? Thanks in advance.
 

produceguy

Lieutenant Junior Grade
Joined
Sep 30, 2010
Messages
1,243
Re: Alpha One Trim Pump Works Then Doesnt

To me it sounds like a bad ground wire or a loose pos connection.
I would def start with the wireing.
 

greg82255

Senior Chief Petty Officer
Joined
Oct 26, 2009
Messages
781
Re: Alpha One Trim Pump Works Then Doesnt

I have some spare wire lying around. I'll start by replacing the positive and ground wires and see what happens. Thanks
 
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