Here's how to fix a jack plate that is not running: First check and replace the 40-amp fuse. The 40-amp fuse is located on the red wire that comes from the relay harness and is connected to either the (+) battery post or the main power switch. Depending on the year your jack plate was made the fuse holder cover will be either blue or black. For best results, replace the fuse even if it does not look blown.
If your jack plate still won’t run, jump the power cord directly to 12V battery.
Follow the black power cord coming out of the unit’s motor to the disconnect point. Disconnect the blue and green wires from the relay harness. Now the green and blue wires can be directly jumped to a 12V battery by touching the green wire to the positive post of the battery and the blue wire to the negative post of the battery at the same time. Reversing this connection will run the unit in the opposite direction.
If the jack plate still won’t run after you’ve replaced the fuse and tried jumping the power cord, it is likely that the actuator needs to be replaced.
If your unit is less than three years old, contact T-H Marine for a replacement. If your unit is more than three years old, contact your local boat dealership or contact a retail location for a replacement.
I have an Atlas Jack plate. I have only used a few times, I bought it new and it is always on going down or up. I replaced the relays and switch and still it continues to keep running. I replaced the fused and just unhooked it untill i could back to the ramp... Im thing the dealer installed it wrong your thoughts.... Randall Hewitt Mayo fl 386-208-3823.... other than that it work with ease on 150 yamaha
tech support just sent me a text, i will call Monday thanks..
I’m trying to do my own repair to save money. My jack plate just stopped working. It won’t go up or down. I figured the motor is just worn out. I ordered a new motor/pump unit and installed it. It didn’t work either.
You mentioned an actuator may need to be replaced. Where exactly is the actuator? Is that the up/down lever on the steering column?
Thank you for contacting T-H Marine,
Sounds like it may be a relay issue, I would disconnect the blue/green wires that run from the hydraulic actuator to where they disconnect at the relay harness. Once you have disconnected them then jump the blue/green wires to a 12 volt battery by touching green to pos and blue to neg at the same time. If the unit operates then it is a relay problem. The actuator is the motor/pump, the motor is screwed on to the housing of the actuator.
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