Help with DC motor

[Donald]

When I got the bow thruster and solenoid pack home I determined I was missing the short wire that supplies fuse #3 with +12V. I figured it fell off when I carried the bow thruster motor to my truck. I am usually pretty careful but the short wire was not on the solenoid pack.

I was at the boat on Saturday pulling off the winter cover and hosing off the dust and dirt from last summer. I took a look at where the bow thruster gets mounted to see if the short wire was there and it was not. But I noticed a 5th wire coming from the dash. And it's got a female spade connector on it which is what is needed to supply power to fuse #3.

So to supply power to the joy stick control fuse #3 and ultimately power the relay coil they pull +12V from the dash, probably after the ignition switch. The schematic shows that voltage to fuse #3 coming from where the +12V battery cable attaches to the solenoid pack.

The bow thruster has its own dedicated battery and maybe the problem is all the battery grounds are not tied together and while the dash maybe supplying +12v from starting battery maybe the -12v from starting battery is never getting to the solenoid pack.

I think I am on the right track.

For now I will wire it as per schematic and go from there.

 

[Donald]

So as a final test before installing this in my boat I connected every together but made a mistake a connected the black from the joystick to A1 on the motor instead on A2. Pushed the joystick and the motor started to spin and continued to spin after I let go of the joystick. Had to disconnect the battery to get it to stop. First I thought stuck solenoid. Then I discovered the wiring error. Fixed it and everything works as it should now.

So I am surprised the motor did what it did with this wiring error. And equally surprised I did not burn or melt any wiring for the joystick. Or joystick electronics.

 

[Jetronic]

Which wire is the black on the joystick end? is it the one marked 12? ot 1 - 4 - 3?

 

[Donald]

Which wire is the black on the joystick end? is it the one marked 12? ot 1 - 4 - 3?

Black wire for joystick goes to ground -12V. Its the bottom dashed wire on the right side of the schematic.

 

[Jetronic]

Ok, I see what happened. You put 12V through the lightbulb into the motor. that wasn't enough to start it but enough to maintain it when it was running. The lightbulb limited the amount of current that could flow. So whatever wattage that bulb is, the motor got less than that.