Above the right side fenderwell, there is what appears to be a starter relay (actually, it is)...
Look for a two yellow wire grouping...
Disconnect from the back side of fenderwell relay...
Turn key on, engine not running and listen for cycling of the glow plug controller...
If no cycling, controller might be bad...
Anyway, by disconnecting those two yellow wires, the glow plugs can't receive any power and this makes it safe to use ether...
JUST A LITTLE DAB IN THE AIR CLEANER WILL DO YA!!!
No really,
no more than a second's duration... If too much, give it time to dissipate... It WILL rattle if given too much...
I had the same problem when I replaced my engine...
Pulled all of the glow plugs and found three Champions complete with warped ends
and blown... I had 5 functioning Beru's and the truck still wouldn't start... I did also have a olive seal leak somewhere between the lift pump to the IP...
I replaced the bad Champions with old Beru's from old engine and put new olives in and Viola!
End of no start problem for my truck!!!
Just came back from double checking with my truck, There are two double wire groups that attach to the fenderwell relay... One comes from the Alternator and then another set comes from the glow plug controller... The ones from the controller are yellow... Better safe than sorry...