M670 Super starting problem

[Alan K]

Have a 1966 M670 Super that wont crank over / cranks over about 1/3 speed. Both scenarios have happened. When it doesn't crank when turning to start position, the amp gauge discharges to 20-25. When it does crank over it is only about 1/4 to 1/3 the speed it is supposed to be and wont start.
Battery tests good. Cleaned battery cables, bypassed safety switch, still have the same problem.
Can use a hand held push button starter switch on the solenoid on starter and will crank and start just fine.
I am assuming I have a bad wire somewhere (switch to solenoid?) or a corroded battery cable inside but, I have juice to starter when using the starter switch.
Anyone else ran into this problem?

 

[flying belgian]

Have a 1966 M670 Super that wont crank over / cranks over about 1/3 speed. Both scenarios have happened. When it doesn't crank when turning to start position, the amp gauge discharges to 20-25. When it does crank over it is only about 1/4 to 1/3 the speed it is supposed to be and wont start.
Battery tests good. Cleaned battery cables, bypassed safety switch, still have the same problem.
Can use a hand held push button starter switch on the solenoid on starter and will crank and start just fine.
I am assuming I have a bad wire somewhere (switch to solenoid?) or a corroded battery cable inside but, I have juice to starter when using the starter switch.
Anyone else ran into this problem?

I was going to say bad starter until I read farther in your post. Now I'm thinking bad wire.

 

[molinegb]

Hot wire from switch to starter. If no change hop across switch . Rewiring a U302 now and is same cct. Could be problem in the molex connector.

 

[Ill John]

GB, what's a "molex" connector? Never heard that term, thanks