Hey John! Missed you for a few days!
Some gauge questions out here I don't have the answers to!
(Looking forward to your answer since I'm having the same problems)
I told them to get a hold of you!
Just what you need! More job with no pay!
This is what your diode installed should look like...
Radio Shack has the diodes and those little non-insulated crimp connectors, but their heat shrink tubing is the shiny vinyl type that isn't good for anything...
NAPA is probably your best bet for the rubberized heat shrink tubing with the glue to seal things up inside.
Diode, Radio Shack p/n 276-1143 and if the local store doesn't have it,
you can order it on line, but if you order it at the store they pay shipping to the store.
The new plug (If you need one, is under $5 at the local discount auto parts stores.