Posted by Fritz Maurer on November 11, 2012 at 09:59:06 from (216.137.138.146):
In Reply to: Re: Ford 7.3 diesel posted by Mark-Ia on November 11, 2012 at 07:15:48:
During operation it's not unusual for the relays and the wiring to be warm; manifold heaters and glow plugs are heavy draw items. That fried relay was not the problem. If the relays are warm when the truck is not in service, something is energizing the relays. Easiest thing to do is remove the ground cables and install a low draw ammeter between the ground cable and negative post on either battery. Then pull the fuses out of the power distribution box while noting the ammeter reading as each one is pulled. Disconnect all owner added junk before pulling fuses. In many cases they just pick up a hot wire somewhere and it doesn't go through the PDB at all. When the PDB is completely empty of fuses, and there is still a draw, the harness is rubbed raw someplace. If there was any torch work done on the truck, check these areas for melted wires.
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Today's Featured Article - Tuning-Up Your Tractor: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
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