I this video I make a dummy pigtail plug to cover the open port on the spare PMD for my 6.5 turbo diesel on the 2004 Hummer H1. This way the open port on the PMD stays protected from dirt, water, and corrosion.

Here are some of the parts that I used:

Below are the links to the products used in this video.

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6.5TD PMD extension harness:
https://amzn.to/3BRcNgy

Spare PMD resistor pack, including #5 and #9:
https://amzn.to/3ODhylF

Spare PMD:
https://amzn.to/43m7iSP

Marine grade heat shrink:
https://amzn.to/3MxbuIK

Butane torch:
https://amzn.to/3OICYxP