for awhile now ive been thinking my glow plugs are going bad. when its cold or i havent drivin it in a week or so it wont start. so last weekend we went camping up at the cinders. go to leave early sunday morn....it wont start! so i do a no no and spray a very little bit of starter fluid on the filter and it fires right up. so i do my reshearch and buy the glow plugs and deside to do them to day. i find this!!! once i replaced it it seemed to be starting alot better. im gonna test the plug ohms this sat to see if i still need to do them.

 

good cath a common 7.3 problem

 

good find, that relay is a problem spot on the 7.3L