AC-DELCO STARTER 40MT LESTER #3974 - Photo ID 24543 

TRUCK & IND. APPLICATIONS NOTE: 142-101, B, D, F; 142-102, B, D, F INTERCHANGE NOTE: 40MT, LEFT HAND MOUNT, 5/8 MTG. HOLES SEE: 142-102 (RIGHT HAND MOUNT)

This is a 12-Volt Delco 40MT Using DE Housing #1970455 (Others), an 11-Tooth Drive (Accurate #4-486), and Lester Armature #1866. The 6243 is the Same Unit, But With Overcrank Protection. The 3978 is the Same Unit, Except Using a Solenoid With "Reversed Terminals". The 3745 is the 24 Volt Version of the 3974.

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