Your replying, is helpful. Thank you.
The engine starts when I jam the bolt somewhat so it makes an earth connection, Otherwise after a time of engine vibration when its running it will not start.
I suspect the bolt end inside the starter casing, rather a nut or tack weld came adrift as the bolt is loose and can be turned. I found there is no way to do up the bolt and/or remove the cable nuts as a result. Making the removal
of the starter motor an issue. As you rightly noted, the other earth cables are attached to the solenoid. Yes, my boat
is an Aluminium 15 meter (50') masthead cutter
. I have a ground rotor off and on switch to isolate the engine when not running. I don't know how to identify a part number for a new starter as backup.
Originally Posted by skipperpete
I donít know why itís loose but I can tell you that itís the starter motor earth cable. The Perkins Prima and the closely related Volvo are both ďabove groundĒ or insulated earth engines but I can see 3 other earth cables in your photo so your engine is probably no longer insulated. .......unless those 3 cables are attached to a momentary solenoid. Is this on a metal hulled vessel ? Has the engine been starting ok?
Yes it can be fixed but not in situ, itís a bench job.