TMD22A - Stop Solenoid

[boatone]

Is that the 55A one - item 6 on the wiring diagram?

 

[nigelmercier]

Is that the 55A one - item 6 on the wiring diagram?

I was going to say 50A, so probably.

 

[boatone]

Yes but the block is isolated from DC negative,

The bottom relay in the diagram closes to connect the DC negative to the block during "stop" (and "preheat") It is energised via the diodes in the wiring loom from the respective connections on the key switch

So Scottie is right.

Thanks for this Vic - I had assumed that the block would be 12v-ve as has generally been the case on previous engines I have owned.

Thanks also to everyone else that contributed. I now know that the solenoid is ok and have a leccy booked to give me a hand to thoroughly check the cabling and connections.

 

[nigelmercier]

I had assumed that the block would be 12v-ve as has generally been the case on previous engines I have owned...

Me too. My engine seemed to be connected to the negative bus, and I didn't think it was a problem, so I didn't do anything about it.

That mistake cost me £2000 for a new saildrive.

 

[boatone]

There is a fuse in the earthing cable, on mine it looks like a white plastic block with two screw terminals.

Leccy spent the day with me yesterday and the fuse was the main culprit - it had failed but no sign of any discolouration or burning that would indicate a major current so put it down to old age. New one fixed the "engine stop" problem.

Then thoroughly inspected all engine bay wiring. Replaced some battery links and couple of other key cables that were undersize and also checked all crimped connectors and remade several. Some earlier heat shrinks had been applied badly and plastic was partially covering the contact area which was not good. End result was a much better charge level hitting the batteries than previously and all the strange warning light issues seem to have been resolved as well.

So, need a run to be sure but hopefully all resolved and a lot more confident about the general state of the electrical system - result!

 

[pvb]

Excellent! Glad you chose that route, rather than going ahead and buying a new solenoid. As I said in post #2 "wouldn't it be annoying to buy a new solenoid and then find that it was only a poor connection?"