Grid Heater - Long

[Cheaper Jeeper]

I wouldn't trust the 6.9 system.

I don't - which is why I put the pushbutton in the line that connects it to the relay...

You want to either go with a push button system preferably with 12V or constant duty plugs or go all the way and do a solid state conversion. As long as the solid state system works well it shouldn't let you burn out glow plugs. On the bad side, a solid state system will not work right if even one plug is out.

And how would that be better than the mod I have done?

The 6.9 system will usually start the truck as will a manual system if even a couple glow plugs are still working.

And this is bad because....?