7.3L Power Stroke Engine and DrivetrainDiscussion of the 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
I keep blowing #24 in the power distribution box. It the owners manual it is labeled PCM power. Does anyone have a link to the PCM wiring diagram? The truck won't run. Just got back form a 1300 mile trip with no problems. I haven't done anything to it since.
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2000 XLT LARIAT CC SB 4x4, front leveling kit, rear add a leaf, hd overload spring pack, 3.5" down pipe, straight pipe, foil delete, K&N fipk w/dry charger, oil guard by-pass oil filter, coolant filter, ccv mod, 203* T stat & housing, brv+,redhead steering gear box, auto meter boost,EGT, rear diff and trans temp gauges, Frybrid wvo kit, 6.0 trans cooler, BTS trans, 4 position chip stock, hi idle, 60 hp and 100hp, ((XM radio))
The only PCM fuse I know of for sure, is the one shared with the Fuel bowl heater. But I didn't think it was 24 unless they changed it for 2k. Unplug the fuel heater, (Back of fuel filter bowl, near the bottom) then replace the fuse and see if it blows again. If not, leave the heater unplugged, I ran mine for 3 years after it blew and disconnected. Otherwise, the heater is about 85.00 I think, from FORD.
NOW in my 99s manual it says that #24 is the "Power distribution box" FUSE, 30a. This is the fuse box under the dash, the one under hood #24 says it is the "Blend door actuator, trailer tow battery charge relay" 10a.
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Jim T.*48* SLAPS Co-Founder, 30.8 yrs RETIRED UAW 6/01/06, Now a full time Technician in the MOANG 12/10/07 My pics! and my New'03 Dually pics!, Charcoal Grey, Black and Grey interior, Black leather seats, Van Turbo/ATS ported housing/WW, Quad "A" pillar pod with Carbon Fiber series AUTO METER Gauges, FUMOTO Valve. BTS BUBBA" /TS 4pos chip, 4" Turbo back straight pipe/stainless 5" tip 131st F/W St.Louis MoAirNatlGuard We're losing the F-15s. BUT BEING HANDED THE KEYS TO THE B-2 BOMBERS at WHITMAN AFB, Near Kansas City, MO.!! We are Lindburghs OWN! Suffering from *PMS,, "Powerstroke mod syndrome"
Fuse #24 (hot at all times) under the hood is the main power to the PCM, switched by the PCM power relay. It also feeds the transmission solenoids, IPR, GP relay, MIAH relay, fuel pump relay coil, and brake pressure switch on the master cyl.
You probably have a short somewhere in one of those circuits. I'd try unplugging the various connectors and see if you have a grounded output terminal on the PCM power relay. Either that or you could use up a ton of fuses.
Fuse #30 in the inst panel fuse box is powered when the key is on and feeds the PCM power relay coil and fuel heater. When that one blows, the PCM power relay doesn't pull in, and none of those things (including the PCM) get powered when the key is turned on.
Thanks guys. It was a frayed wire for the IPR that was touching and breaking the fuse. Taped it up and good to go!
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2000 XLT LARIAT CC SB 4x4, front leveling kit, rear add a leaf, hd overload spring pack, 3.5" down pipe, straight pipe, foil delete, K&N fipk w/dry charger, oil guard by-pass oil filter, coolant filter, ccv mod, 203* T stat & housing, brv+,redhead steering gear box, auto meter boost,EGT, rear diff and trans temp gauges, Frybrid wvo kit, 6.0 trans cooler, BTS trans, 4 position chip stock, hi idle, 60 hp and 100hp, ((XM radio))
if you had a problem there, id check where the main harness attaches to the motor harness on the drivers side valvecover-underneath there is VERY suceptable to chafing as it contacts the valve covers-bend the bracket a bit to eliminate rubbing to avoid future issues!
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Currently under construction:
2000 superduty standard cab shortbed with 12v cummins!
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