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Tilt/Trim Problem

R

Roger1998

New member
My 1998 Mercruiser tilt/trim is doesn't work. Hit the switch and no clicks... nothing. Ground seems good. Jumping the green and blue wires makes the pump work. Replaced both solenoids with no effect. If I jump a hot wire to the hot bridge between the solenoids, oddly enough, the switch works normally in both directions and to trailering trim height. The fuse is good, and the hot bridge indicates 12 volts without the hot jump, but it does not work without the hot jump. I am going to stare at it some more and see if I can figure this thing out!
Roger in Alaska
 
You more than likely have a significant resistance in the wiring for the trim motor...see what the voltage is on the "hot bridge" ( with no jumper) when you hit a trim button...
 
While the following diagram isn't your exact model, it may help give an idea of what to generally expect... <It's what I could find on the quick from online for you with hopes it helps some...

Sometimes the wiring in/at/behind the control handle might become chafed not allowing the power to transfer when hitting the trim switch... that, or the wire plug connector is compromised maybe with corrosion, etc. that sits behind the controller panel.
Try following/testing the Red to Red/Purple wire between the two units... Yours probably won't have a 20-AMP fuse at the controller like shown.

1748828695239.png
 
That is earlier dash mounted trim panel but the primary difference is your switches are in throttle lever.
Relays and wiring are essentially shown correctly. You said above the fuse is good. I believe your fuse is the square block type. Regardless, I believe you have a bad fuse or red wire. 12 volts on a meter means nothing as it draws virtually no current. Your jumper wire trick proves your issue is in the power lead or fuse.
 
Thanks for the quick responses. I'll get back on it in the morning, especially checking out the block fuse and the connections along that wire.
 
the square block (90A) supplies power to the pumps buss bar, from there is a 20A glass fuse "A" that powers the helm buttons for the relays
 
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