The book I have says it is a 1997 F-Superduty Class A Motorhome chassis. It does say for additional information refer to 97 F-250 HD, F-350, F-Superduty Service manual. The VIN number starts with 3FCM.
It is a Newmar Mountain Aire, I think maybe they bought up some older chassis so that they could keep using the same design (with the tag axle) for a couple of years until ford changed to the single axle with the bigger wheels.
The wiring diagrams for the Ford part (F53) are above.
The rest was wired by Newmar.
Sorry I can not help you with that part.
The For wiring ends at about the back end of the fuel tank at a plug on the drivers frame.
Newmar plugged into that plug and wired the back end of the Motorhome.
The best I can do is post a photo of the plug where the Ford part ends if you want me too..
I hadn't looked at it in a while and when I got out there the engine battery was dead so I had to charge it. The running (tail) lights and are working. I can't see if the dash lights are working, I'll look when it gets darker outside. When I turn on the left blinker, I can hear the flasher relay operating (which helped me find it) but the left indicator on the dash doesn't blink. When I turn on the right blinker I get nothing. The brake lights don't work but I am getting 12 volts on the output of the brake switch. When I turn on the hazard switch I don't get anything either.
Check and make sure all the bulbs on the back end are good.
You may have rear bulbs out and one turn bulb out on the dash.
If they all good check the frame ground for the tail lamps.
I do not know where Newmar put it as I have a Coachmen and they are different.
Also check for rodent damage to wiring under along the drivers side frame.
If everything looks good you may have a bad Multi-Function Switch.
The high middle switch doesn't work either whicch makes me think there is a connection problem. I'm goiing to see if I can figure out where all of the connections are. In the morning once it's daylight and the bugs are calmed down I'll see if I can find that connetor you mentioned.
Well, I have been working on my leveling system problem but I finally got back onto the taillight issue. By cleaning the connector at the back of the fuel tank (the pins were very green) I got everything except my brake lights working. There is one pin in that connector that is hot with the brake depressed, but it is not wired off the other side of the connector so I guess it is not used. I went back to the multi funtion switch. I have 12v to the switch from the brakes on the light green wire, but I don't get it on the O/LB or the LG/O. I jumpered the LG (incooming voltage from brakes) to these wires and each lit up individually as I did that. I have cleaned the connector a couple of times with contact cleaner, so it looks like the problem is the multi-function switch. Do you know how to pull this? It looks like I just need the upper portion, but do you have to replace the whole thing?
3. Remove two self-tapping screws that retain the multi-function switch (13K359) to the steering column tube casting. Disengage multi-function switch from casting.
4. CAUTION: Do not damage locking tabs or PRND21 cable.
Disconnect the two electrical connectors.
Multi-Function Switch, F-Super Duty Motorhome
1. Install the two switch electrical connectors to full engagement. The wiring for the switch is to be routed under the PRND21 cable.
2. Align the mounting holes on multi-function switch with the holes in the steering column tube casting. Install two self-tapping screws making sure to start the screws in the previously tapped holes. Tighten to 2-3 N-m (18-27 lb-in).
3. For automatic transmission (7003), verify that the PRND21 adjustment is correct.
4. Install the steering column shroud.
5. Note: When the battery (10655) has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) (12A650) relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 miles) or more to relearn the strategy.
Connect the battery ground cable.
6. Check the steering column tube (3514) for proper operation.