We finally were able to identify the whitish silicone-like material used to waterproof various electrical connections including the output lug on the 200 amp alternator and on the starter.
![](https://hmmwvsystems.com/wp-content/uploads/2019/01/2019-01-08-11.36.18-e1546977363658-1024x395.jpg)
This material is Dow Corning 737 Neutral Cure Sealant. It is used in aircraft applications as a sealant on plastics, metals, rubbers, glass and painted surfaces. This is the correct material to use when rebuilding or repairing a starter, and is the material originally used during manufacture. It is available from a number of vendors, including Amazon and Ebay.
The following link provides useful information and also sells the product:
https://www.skygeek.com/dow-corning-737-neutral-cure-sealant.html