ok, I checked voltage of both batteries and they are both over 12 volts. checked relay and it is functioning properly, ie over 12volts when turn key on. before I change the glowpugs is there another piece of the puzzle I should check? I understand the harnesses are prone to going bad? I wann check all the easy stuff before i pull the plugs out. Thanks

 

Are you getting white smoke at all?

 

yes. even when the truck is plugged in it will smoke a little when it starts. can also smell what seems to be unburnt fuel in the exhaust. the last 97 I had did same thing until my buddy discoavered a short in harness(intermtant) that ccontrolled high pressure oil pump. I havent found that to be true with this truck. 128000 miles. maybe time for injectors but fuel milage and power dont seem to be affected once it warms up. I have a hypertech programmer and its programmed to stage three. just installed afe cold air intake cause I blew up the stock one when I put too much starting fluid in. forgot to plug it in and would not start.

 

Have you checked the glowing relay?

 

yep. glowplug relay is workin fine. 12.67 volts when key is turned to run

 

I know there is a way to test glow plugs, by resistance. However, i have not tried this method.