I am now a member, I have followed this forum for some time and got a lot of help from reading others posts, but I joined because I can't locate any post with my specific issue. Here's the skinny, I have a 1994 Georgie boy Cruise Master 31' motor home with a 7.5L engine, that's a 460 for some who don't think in liters. it is EFI and has some strange wiring for relays etc. We were in a no start situation with 42 psi fuel pressure and holds it. We had spark and it appeared the injectors were pulsing, turned out to not be true. Indications led us to replace the fuel pump relay. No help, so we finally found the EEC relay, changed that, still nothing, the engine will fire on starting fluid, but now the fuel pump will not run, so I went to the impact fuel shut off and found no power, jumping the switch to 12V gave me a running pump with pressure, but no start. After reading a number of no start posts, and I am indebted to some of you for your much greater knowledge and posts, it looks more and more like the EEC might be fried, but I don't want to go to the expense of replacement until I know for sure. I'm pretty new to EFI and all these sensors, but am learning fast. I have a schematic of the engine electrical, but many of the wire colors aren't the same on the RV as they are in the schematic. My BIG problem at the moment is where in the world, or in the engine compartment is the OBDI test socket on the 94 Cruisemaster? I would really appreciate a simple way to tell if my EEC has died, or worse perhaps the Computer?
The unit was running fine, I backed it into its place after getting all new tires and it started once ran for about 2 or three minutes and hasn't run since. Thanks very much for any help you may give,
Hoakieman

 

Hi Friends, So far no help with my question above. Am I in the wrong place? I need help troubleshootong the 7.5l engine wiring?

 

The OBD-1 test socket will be under the doghouse cover, on the left side of the engine compartment. It is supposed to be clipped into a holder from underneath (which makes it look like it is connected to something, when it's only plugged into a holder).
You may be asking in the wrong place; IMO you would do better to search in this forum, specifically for Ford RVs. YIf you search, you will find posts by a gentleman known as Subford, and he will have posted pictures of the OB1 socket

Ford Motorhome Chassis Forum - iRV2 Forums