| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | There should be two wires, one to the motor, one to the frame, which would be ground. It is often easier to just get a 12 volt motor that fits rather than deal with the old one if you are going 12 volts. Easy to touch one wire to pos. and one to neg. momentarily to tell which is which.
Important to check core for leakage. Probably only good for 3 to 5 psi, so be careful.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| 
