Hydro Electric solenoid test issue

[imported_scott_r]

Hi,

I need to test the shift solenoids on a 1972 Johnson 125 hydro-electric lower unit. The powerhead has been removed. I've performed the ohms test which the manual says should produce 5-7 ohms on the green and blue leads. I get a reading of 6 ohms on the blue wire but over 8 ohms on the green wire. A few questions:

What typically could cause a higher than specified reading on the neutral solenoid?

If 12V is applied to the green lead (for neutral) and both green and blue leads (for reverse), will you hear an audible click, or some indication that the solenoid is energized? (I know the driveshaft must be turning for the shifter to actually engage, but I've assumed the solenoids will energize regardless of the driveshaft turning or not; is this a bad assumption?)

When I tried applying 12V to the leads I got a small spark when grounding the circuit. I assume this means a short, likely through the green wire. The wires appeared fine when I re-installed the gearcase, but I suppose something could have happened during assembly. Any suggestions on a likely cause of the high ohms reading on the green lead and possible short circuit?

Thanks!

 

[F_R]

Re: Hydro Electric solenoid test issue

8 ohms could be nothing to worry about, or could be an indication of a bad wire (corroded or almost broken in two). A low resistance would be more of a cause for concern (shorted).

There is not a heck of a lot of movement in the solenoid. You may hear a click, but you may not. Can't say that I've ever made an issue of listening for it.

Yes, the solenoids are independent of the roatation. Makes no difference whether running or not.

A small spark would be normal. A serious zap is not. It is an inductive load. Inductive loads spark more than simple resistive loads.

Personally, I don't think there is a problem with the solenoids. Why? Are you having shifting problems or just looking? Obviously, it can't shift with the powerhead off.

 

[imported_scott_r]

Re: Hydro Electric solenoid test issue

Thanks for the reply. I've never run the motor but there wasn't a shifting problem that I'm aware of. I simply wanted to test it before I put everything back together. If there's no audible indication or other way to confirm the solenoids are OK, I'll just assume they're fine and move on. I've heard they don't fail often.

Thanks again.