Here's a video highlighting the differences between Automotive grade wiring and electrical connectors vs Marine grade wire/connectors. I use Marine grade wire & heat shrink crimps almost exclusively on all of my vehicle builds. Please leave any comments or questions below. I hope this video helps out in your build.

Note: The links below are my Amazon Affiliate links, I make a small portion each time someone purchases from Amazon using one of my links, at no extra cost to the buyer. I only provide links to items that I personally like and use myself. i use the money to put back into my builds and support making videos/posts. If you prefer not to use my links you can search for the same items directly off Amazon. Thank you for the support!

Titan Heat Shrink Crimp Tool - On Amazon here: https://amzn.to/2ARiXRv
Wirefy Heat Shrink Terminals - On Amazon here: https://amzn.to/2WXJUvJ
Ancor Brand Duplex Marine Wire - On Amazon Here: https://amzn.to/3bYHMIe
Ancor Brand Primary Wire - On Amazon Here: https://amzn.to/36sR2TD
Split Wire Loom - On Amazon Here: https://amzn.to/2zgeN5y