Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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Check the voltage drop across the Glowplug relay. Place the DVOM leads on the big relay terminals and read what the voltage drop is when the relay is active (up to about 1.5 to 2 minutes after the key is turned to Wait-to-Start). A reading of more than 0.3V and the relay is toast (remember you are reading the drop across the relay, so the bigger the number, the bigger the voltage drop).
To check the glowplugs: There are 4 connectors going into the valvecover gaskets on the engine. Two on each side. Each connector has 5 pins. The middle on each connector 3 are for the injectors, the outer 2 are for one glowplug each. Measure the resistance from each glowplg pin to ground. It should be in the 0.1 to 2 ohm range. Going the opposite direction (from the harness side connector pins back to the GPR) you should get no more than 0 to 1 ohm.
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.