Have replaced glow pugs, relay and still want start, what else can i test
SOURCE: ford f350 7.3l diesel carnks but won't start
Check your battery voltage while cranking. If it's too low, the electronics won't work and the injectors won't fire. If the batteries are down a bit, there won't be enough power to turn the engine over fast enough to start. It needs a minimum of 100 rpm and 8 volts while cranking. You also might try waiting till you're sure the GPR has dropped out. That takes the GP load off the batteries and may get the voltage up enough to get it to start, oh and also does the tach move when you're cranking? If not, then chances are the CPS is the culprit.
SOURCE: 1991 f350 7.3 diesel hard starting in am
you will find that it may be the glow plug timer is faultycausing the glow plugs not getting hot enough
SOURCE: Problem with cold starting Ford 7.3L Diesel at > freezing temps
most likely the relay. its located to the left of the fuel filter( looking at the motor from the front). my experience is that they only last about 50,000 miles. the part costs about $20 at an navistar dealer. remove the cowl over the filter, disconnect the batteries(so you don't short the new relay out if you cross the polarity with a wrench) ,remove the four wires from the ceramic relay, un-fasten the relay from the base. reverse the process with the new relay. CAUTION; do not over-tighten the nuts on the wire studs, you could crack the ceramic relay.(iv'e done it) . hope this helps
SOURCE: ford 2002 f250 7.3 diesel won't start on cold
It probably is your glow plugs which are controlled by the cold start relay. They burn out over time. This is normal. Haynes Diesel Engine Repair Manual, part 10330, will walk you through the diagnosis and replacement easily. It's about $20. Hope this helps.
SOURCE: how do i test the glow plug relay on 2002 ford
test by puting a volt meter to the glow plug top and earh and check for voltage
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