Here we go again.
This will be the third time I've had to look at this.
The last time was about the same time last year when I had rebuilt the engine and gearbox. I noticed that my previous repair had let moisture in to the top of the solenoid housing so I thought that's it its going to get sealed to IP 68 at least!
In order to do this I used silicone RTV sealant and a hot melt glue gun, its worked very well however at the end of last year I noticed that I couldn't always get the OD to switch in, so today being the first really good weather I thought I would have a look, what I found was:
With the ignition on in 4th gear measuring the current I was only drawing about 1.5 amps which is the hold current not the pull in current, so the switch on the top of the solenoid was playing up, out came the solenoid and obvious really where I had use hot melt glue to seal the cover the solenoid of course is directly above the exhaust pipe and the glue had melted and run between the contacts on the switch thus stopping the pull in part of the coil from working.
Cleaned it all off and re-sealed it ... carefully using just silicone RTV and self amalgamating tape this time and hooray
it works again and being such a nice day took the old girl for a lovely run in the country side, must take the wife next time.
Paul.

This will be the third time I've had to look at this.
The last time was about the same time last year when I had rebuilt the engine and gearbox. I noticed that my previous repair had let moisture in to the top of the solenoid housing so I thought that's it its going to get sealed to IP 68 at least!
In order to do this I used silicone RTV sealant and a hot melt glue gun, its worked very well however at the end of last year I noticed that I couldn't always get the OD to switch in, so today being the first really good weather I thought I would have a look, what I found was:
With the ignition on in 4th gear measuring the current I was only drawing about 1.5 amps which is the hold current not the pull in current, so the switch on the top of the solenoid was playing up, out came the solenoid and obvious really where I had use hot melt glue to seal the cover the solenoid of course is directly above the exhaust pipe and the glue had melted and run between the contacts on the switch thus stopping the pull in part of the coil from working.
Cleaned it all off and re-sealed it ... carefully using just silicone RTV and self amalgamating tape this time and hooray

Paul.