MY 1997 is having the same code P1365 and if its cold wont start but when it gets warner as the day goes on it starts. I replaced these glowplugs a year ago and about 15K. I cant believe these GP's only last a year.

Is the only way to tell if its the glow Plug relay compared to an actual glow plug is to test each plug?

What the test to see if its the relay?

I hate when both my diesels are not running right!