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Howdy, Y'all! I just got a new to me 1989 F700 with a 6.6L New Holland diesel. It has an automatic transmission, likely Allison. I drive it the 6 hours back, capped at 58ish mph. I'm guessing that was likely about 2,600 - 2,800 rpms. Guessing because the tach and fuel gauges don't work. The truck was shortened to about 10/11ft behind the cab. I'll check the usual culprits (governor springs, fuel plate, timing) to increase it.
The VIN #1FDNK74P9KVA39722 - if someone could help decode that, that'll be great.
I am a diesel mechanic. I do actual engine swaps, rebuilds, and teardown. The issues I am running into are not in that normal wheelhouse for me.
1. I have no power out to the rear lights. The entire 6 hour drive only the rear left turn signal worked. I was going to change the rear light sockets out and go 3 bulb instead of 2 bulbs. I put a voltage meter on the 5 wires going back to the lights. I got power on only one of them, both constant and a little spike when brake was pressed, now nothing on any wires. Has anyone ran into this, and how was it resolved? Where is the turn signal switch in these trucks? I'll need it for the rear turn signals at the very least. Does anyone have a wiring diagram for the truck, or list of where the grounds are?
2. The electric brake light on the dash is on all of the time. The red brake light on the dash is on intermittent. When I shut off the truck, there's an electric motor that's on all the time, I have to disconnect the batteries for it to shut off. I don't know what it is, or if it's related to the brake light, or how to go about fixing it.
I know it was long, but I do appreciate y'alls time in reading this and any help y'all may provide.
@subford I saw some other threads in Google before signing up where I think you shared some information similar to above. It wouldn't let me send you a PM.
N = Class 6==19.501-26,000 lbs GVWR, Hydraulic brakes.
K74 = F700 diesel, cab model
P = Ford (Brazilian) six cylinder 6.6L diesel engine
9 = ignore, Ford use check digit
K = 1989 model year
V = Kentucky Truck Plant
A39722 = serial number
The white plastic certification lable will have more info like transmission, axle etc.
Rear light power: Start at the front of the truck at the brake light switch, fuse panel, turn signal switch. See where the power is and where is stops. Tedious, no magic to trace it down.
Turn signal switch--should be in the column where the turn lever is? Flasher should be on the firewall near the column....nothing there?
Brake light and electric motor.
Does the electric motor kick in when the engine is running when you hit the brakes?
The electric motor is the backup for the hydro boost. If you loose the engine, or as happened to me with a rental truck, you loose the belts, the electric motor will give you power assist as long as you have juice going to it.
On some of the trucks at work the pedals would get worn and sloppy and the pedal would droop enough at rest to trigger the motor--just sitting there with the engine off. So see what condition your pedal, pedal stop and return spring are in.
So we know you have hydro boost--do you have a yellow parking brake handle on the dash?
Look on the back of the rear axle on the backing plates. Are there "cans" about 6" in diameter attached to the backing plates?
N = Class 6==19.501-26,000 lbs GVWR, Hydraulic brakes.
K74 = F700 diesel, cab model
P = Ford (Brazilian) six cylinder 6.6L diesel engine
9 = ignore, Ford use check digit
K = 1989 model year
V = Kentucky Truck Plant
A39722 = serial number
The white plastic certification lable will have more info like transmission, axle etc.
Rear light power: Start at the front of the truck at the brake light switch, fuse panel, turn signal switch. See where the power is and where is stops. Tedious, no magic to trace it down.
Turn signal switch--should be in the column where the turn lever is? Flasher should be on the firewall near the column....nothing there?
Brake light and electric motor.
Does the electric motor kick in when the engine is running when you hit the brakes?
The electric motor is the backup for the hydro boost. If you loose the engine, or as happened to me with a rental truck, you loose the belts, the electric motor will give you power assist as long as you have juice going to it.
On some of the trucks at work the pedals would get worn and sloppy and the pedal would droop enough at rest to trigger the motor--just sitting there with the engine off. So see what condition your pedal, pedal stop and return spring are in.
So we know you have hydro boost--do you have a yellow parking brake handle on the dash?
Look on the back of the rear axle on the backing plates. Are there "cans" about 6" in diameter attached to the backing plates?
It does have the 2 cannisters, and this fun clamp.
It does have the yellow handle on the dash. I have heard it when hitting the brakes while driving. At one point in the return 6 hrs drive I could smell like burning brakes. Haven't since then.
I'm in NE under a winter weather warning and I don't feel like bundling up, so I'll check that brake spring and assembly in a couple days when I'm off and it's supposed to be warmer.
I heard the motor a few times, but I can't say for certain that it was running the entire time. I can only hear it when the truck is off, so it could be drowned out by the sound of the engine.
It's not going on the road until the wiring for sure, but will take longer knowing the pressure issue of the brakes.
It does have the 2 cannisters, and this fun clamp.
It does have the yellow handle on the dash. I have heard it when hitting the brakes while driving. At one point in the return 6 hrs drive I could smell like burning brakes. Haven't since then.
I'm in NE under a winter weather warning and I don't feel like bundling up, so I'll check that brake spring and assembly in a couple days when I'm off and it's supposed to be warmer.
The things I see wrong in that photo is scary that you drove it 6 hrs on the highway
There was no mention of pushing the yellow button on the dash so I ask did you
If the copper colored line is actually copper and not copper coated steel that’s not good, the bracket that supports that brake line where it connects to the rubber hose is hanging loose, so the line is bouncing and rubbing against the frame rail
The vise grips on the rubber line tells me a line or wheel cylinder is leaking and they clamped off the rear brakes so that 6 hr drive was with front brakes only
The burning brake smell was either the front brakes getting hot doing all the stopping or the rear brakes dragging from the parking brake being applied
The white tag on the door or door jam will tell what the original wheel base was so one can tell if the truck has been shortened or stretched
The Ford 6.6 and 7.8 use a Bosch P Pump similar to what is used on a 5.9 or 8.3 Cummins, the Ford and 8.3 don’t fair well with governor springs kits to increase max rpm like a 5.9 does
There’s a tach probe sticking out of the clutch housing with 2 wires that operates the tach, it’s common to find the wires broke in that area
For the electrical issues check fuses first, find the brake light switch and check for power going to and from the switch. The turn signal switch is located in the column under the steering wheel like they are in the pickup models
I have the wiring diagrams for my 93 model But it’s several fold out pages and I’m not sure if it is the same as a 89 model
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