Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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I don't know if I read everything correctly or not. If you check the glowplugs at the gasket pins, the reading should be 0.1-2.0 ohms from each connector's outer pins to a good engine ground (so pins 1 & 5 on each connector, pins 2, 3, & 4 are for the injectors). Going from the engine harness side of the connector (same corresponding pins) back through the wiring to the GPR large terminal (the one that does not have voltage on it with key off), you should get 0-1.0 ohms.
As far as the Glowplug relay, measure the voltage drop across the relay when the plugs are (or should be) active. This means having one lead on one large terminal and one lead on the other large terminal. A reading (the voltage drop) of more than 0.3V and the relay is bad.
Battery condition and starter make a huge difference in cold starting as well, so maybe have the batteries load tested (independent from each other, cable disconnected from both). Make sure all cable connection ends are clean and tight.
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.