Starter

[Laddh]

Hey gents... I have a 1940 buick roadmaster with a straight 8..It wont crank over with the throttle pulled out or the gas petal..I have to jump it @ the starter any suggestions.....Ladd

[Buick35]

Probably a bad vacuum starter switch.I had a push button on my 35s until I bought a good vacuum switch.

[Mark Gregush]

When you post you need to put the pertinent information in the title, so people know what you are working with, also, there is a Buick section down below if you have not seen it. 

[Pete O]

1 hour ago, Buick35 said:

Probably a bad vacuum starter switch.I had a push button on my 35s until I bought a good vacuum switch.

Ditto.   Take the air cleaner off an find the vacuum switch.  It will have a couple wires attached to it.  There is a spring loaded tab in the switch that rides against a cam on the throttle linkage.  As the throttle opens and the cam rotates the tab should spring out which closes the circuit to the starter solenoid.  If it stays retracted, there's either corrosion or gunk in the switch preventing free motion.   Sometimes a little rap with a screwdriver handle will shock it free