2018 Merc 90 EFI 4 stroke - Power Trim Up Does Not Work - Troubleshooting

[mwelsko]

2018 Merc Serial 2B4937##

Power Trim "Up" Stopped working - Need some additional troubleshooting help or direction.

1. Down Works on Both Motor and Throttle switch.
2. Reverse Blue and Green wires to lift motor and Down switch elevates motor, motor runs fine in either direction, power is good, hydraulics good.
3. Replaced Both Relays, still same symptoms when Blue and green leads are reversed and normal. Swapped relay positions and still same symptoms. Assume relays are good at this point.
4. Next Steps?

Does any one know where I can get an accurate wiring diagram?

Any additional help appreciated

[robinr011]

Hello mwelsko,
changing the leads tells me that the wiring is good. Next bet would be the switch, throttle/ motor. To rule out the motor try a cheap momentary at the motor and see if it works. If yes... throttles your guy.

robinr01

[SilverFox579]

Does any one know where I can get an accurate wiring diagram?

A genuine Mercury service manual has great detailed information.

Posting in the 4-stroke forum will be quickest way to get additional help - Mercury - 4 Stroke / Verado

You can get a service manual from any Mercury dealer but I recommend European Marine since they sponsor the 4-stroke forum.