Trim Motor runs and raise motor but doesn't when try to lower motor

mscharff

Recruit
Joined
Nov 28, 2013
Messages
1
My trim motor runs and raises the motor but when I try to lower the motor it makes no sound and motor won't go down on my 1978 150 HP Mercury Black Max. What could be wrong?
 

Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: Trim Motor runs and raise motor but doesn't when try to lower motor

Check your down relay. You can swap them for a quick test.
 

joed

Lieutenant Junior Grade
Joined
Sep 28, 2002
Messages
1,135
Re: Trim Motor runs and raise motor but doesn't when try to lower motor

Check your UP relay also. They are interlocked so that a defective UP relay can cause the down to not work.
If swapping them reverses the issue, replace them both.
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,508
Re: Trim Motor runs and raise motor but doesn't when try to lower motor

That's gonna have up and down "solenoids". Not relays. They are separate for up and down. Not interlocked. One is probably bad..........check all connections first. Make sure you have constant power on both large red wires goin' to tha solenoids. Check for power on tha larger "green" wire when ya hit tha down button. No power there will indicate its bad.
 
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