Quote
Acy
I have to agree with you, they aren't 6v...mine are 5 volts. Marked right on them.


Ah, I see... I stand corrected.
Well, I think we can all agree that Isuzu does in fact supply them with 12V on high glow, at least. I've only looked closely at the wiring, not at the plugs themselves - but 12V on high is factory wiring unless my memory is incorrect.

1988 Isuzu Trooper LS
2.8l Isuzu 4JB1-TC intercooled turbo diesel
www.dieseltrooper.blogspot.com