Corrosion prevention is so simple, yet so understood.
On our vehicles electrical isuses are almost 100% caused at a connection or termination that gets green/rusty/corroded and starts to get intermittent. This is what makes themn so hard to find and fix. Cars tend to do OK with dry electrical connections. Add salt and water from east coast roads and the reliability must get worse.
Sinicole grease (or any grease really) impoves the electrical connection and protects it. It will NOT "insulate" the conenction or make it weak, it only makes it better.
In the world of boats that operate on the ocean, almost all boats that won't start or equipment failures that result in a tow back to your dock are the result of failures like this.
On my boat an in my cars, i coat all exterior electrical connections with the 3M Silicone paste.
It provides 100% stay put won't wash off priotection to the connection, as well as making it easy to disassemble / reassemble any connectors. WD40 and similar are too thin to provide lastin protection, but they are great cleaners and easy to use with a bit of fine sandpaper. Sometimes just breaking and re-making connections is enough, but spray out the crud with wd40 and dab on some paste and you will NEVER have a problem.
Even the best electritians cant trouble shoot an old piece of equipment wich complex wiring. They ususlly just start by takiugn appart cleaning and greasing every connection and groud they can find. Most of the time that solves the issue. Rarely is there a bad part.
Ass salt water spraying around and engine and you will see alternators and starters that only last a year.
I love my Trac, I have had to learn to love boats.
12' longboard
17 Boston Whaler
30 Mainship Diesel