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Jeff Martin
Frequent User
Username: jeff_r_1

Post Number: 725
Registered: 07-2018
Posted on Saturday, 12 April, 2025 - 11:34:   Edit PostDelete PostView Post/Check IP

I accidentally tried to start the car while it was in gear, and the park brake was on.
It lurched forward and thought nothing of it, but when I slipped it out of gear, the starter was dead when the button on the switch box was pushed.
It acted like something was disconnected, rather then a grinding noise of a bunch of stripped spur gears.

I checked the wiring diagram and the gold wire was traced back to terminal 10 on the switch box with no fuse in-between.
About 10 minutes passed before I was going to troubleshoot and zero in on the fault, but I thought I would give it another try, and everything was fine.
The engine turned over as if nothing had happened and it continued to do so with multiple tries.

Is there some sort of thermal over-load switch somewhere, possibly in the switch box itself that's connected to the wire that operates the solenoid ?
I looked in the parts manual and nothing is mentioned or labeled as any thermal overload circuit.
I did a search and didn't find anything about this.

What am I missing here ?
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Martin Webster
Experienced User
Username: martin_webster

Post Number: 60
Registered: 09-2018
Posted on Sunday, 13 April, 2025 - 21:40:   Edit PostDelete PostView Post/Check IP

I don’t think you are missing anything Jeff. I have gone through all the parts and service manuals too etc and there is no reference to overload protection and I’m not surprised tbh. The only reason I can think that the starter failed on the first attempt is that perhaps the relay was jarred when you lurched forward and the shock perhaps disturbed the contacts? Alternatively there may be another loose contact somewhere, who knows? I suppose if it is now starting consistently then it was just a passing gremlin.
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Jeff Martin
Frequent User
Username: jeff_r_1

Post Number: 726
Registered: 07-2018
Posted on Monday, 14 April, 2025 - 12:15:   Edit PostDelete PostView Post/Check IP

I'll check the ground(s) to the relay (solenoid).
The relay is rubber mounted, so a ground wire runs from there, to one of the small machine screws holding the Bijur oil line in place.
Then from there, another ground wire goes to the frame.
I know the frame ground wire is clean as it shares the braded starter wire and that was looked after when I had the whole front of the car apart when I was doing engine work and painting the frame. (the floor was out too)

So far, it has continued to function properly, but my Dad and I went to a concert last night so I made sure the crank was in the car.

The original relay broke on the inside, so I stole the one from my Jaguar.
Since then the Jag got the new one, so the one in the Bentley is pretty old being from the 1968 340.

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