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Caterpillar 3208 Mack Engines Scandia E4-210

Approx. 16 inch overall length. 19011529, 19011530.  IMS (integrated magnetic relay)  Notice how solenoid mounting bolts go through solenoid and thread into housing.   11 or 12 teeth on gear. Non-rotatable nose.      Solenoid ground wire on left. S wire goes to IMS on right.     OCP (over crank protection)  

Mitsibishi. Notice how solenoid bolts go through starter and thread into solenoid.  

41MT. Similar to 37MT but internal parts are different. Small post on solenoid: Activates from ign on right, ground wire on left. Optional OCP over crank protection.  

Delco approx. 19 1/2 inches end to end. 10461033, 10461038, 10461052, 10461533 plus many others.   Ground wire on left of solenoid, s terminal on right.  Some have OCP (over crank protection)   11 teeth bendix most common. Also available in 10 or 13.  Roughly 3 inch back plate length.  

Delco 17 1/4 inches overall length. 10461008, 10461089, 10461280 plus many others.   Ground wire on left, some are internally grounded. S terminal on right. Some have OCP (over crank protection)   Some have ground post on back, some are internally grounded.    12 teeth on bendix, some have 10.   Approx. 3 inch length on

Delco 24SI. 145 amp. Pad mount. Plastic cover on back.  4 pin plug in on side normally not used.

Delco 33SI pad mount.                                Threaded hole on side for ground cable. Optional smaller output terminals.    

Delco 33SI. 110-135 Amp. Same mount as others makes update easy. Similar to older model 30SI. Auxiliary smaller output terminals on side.  

Leece Neville Pad Mount. Positive terminal on right. Negative terminal on right.