I'm curious about these boxes. Does anyone know anything about these things other than they are an archaic form of a computer? This question has started because my box finally broke (the connector itself) and I had to go get a new one. Advance had like 6 different options; some with "High Altitude Emsissions" and some without. Now truck wont start. I have 12v going into the box, but only 5-6v coming out of all 4 wires. Anyone know if that's right? any help would be helpful

Hawkins

 

Did you get the correct color grommet for your year?

"Ignition modules, 74 (black grommet) and 75 (green grommet) are year specific and will not interchange. 76 to 79 (blue grommet) are interchangeable.
Ignition modules: 1974 is 1974 ONLY / 1975 is 1975 ONLY.

Blue module introduced in 1976 was used well into the 1990's.
D4AZ-12A199-C 1974 only DuraSpark ignition modules identified by a colored plastic insert located above where the wires feed out.

2 others: One has a red plastic insert, the other has a yellow or brown plastic insert.
Red module is D7AZ-12A199-A used in some CA vehicles ONLY.
D9AZ-12A199-C (replaced D8AZ-12A199-A). One of these modules is yellow , one is brown .. Since the part number was replaced, I cannot recall which module was which color.

These modules were used in 1978/79 302 & 351M/W vehicles sold in high altitudes only. 351W: Passenger Cars & Econolines only.
1U2Z-12A199-AA (replaced D6AZ-12A199-B - D7AZ-12A199-B - D8VZ-12A199-A - D9VZ-12A199-A) .. Ignition Module - blue insert (Motorcraft DY-893) / Available from Ford.
Myriad 1976/90's FoMoCo vehicles.

Green Sales in OH.
Collectors Auto Supply in WA.
Haven Ford in KS.
Klimesh Motor Sales in IA.
Bob Allen Ford in KS.
Freese Motor Inc in IA.
Wesley Obsolete Parts in KY.
Dennis Carpenter Ford in NC.

 

Yeuppp!

Rich covered it all pretty well.....

 

My truck was built in California, sold in Arizona. Truck is now in Florida. When mine died I went to autozone, installed it and it runs fine.
I had no idea about all that info..

 

As mentioned, you'll have to have the correct module for your vehicle. It seems like the parts person could have established which was correct. In general, if you match the colors of the "sealing block" (as Ford calls it in their service bulletins), it should work. In their service bulletins and training course manuals Ford provided troubleshooting and diagnostic procedures to determine the health of the modules. They are not the same for all modules. More than just voltage values are required. It is a bit complex to cover here. Modules are heat sensitive. Sometime they fail when hot and then recover as they cool. Sometime they never recover. (This happened to me in the AZ desert.) I don't have a schematic of any of the modules, but if you really want to learn more about their operation and the diagnostic procedures check service bulletins 79-17 and 80-19 and training program manual CTP-1979-5. A prudent person should always carry a spare module. It's like a spare tire...........you'll never know when it'll be needed. Motorcraft (& perhaps NAPA) modules seem to have a slightly better reliability record. In the past O'Reilly offered a lifetime warranty (but that doesn't mean that they're more reliable).

 

I have a 75 engine in my 66 truck and the module gave me so much grief I put a points distributor in it and a Petronix II ignitor. Never regretted it.

 

As mentioned, when mine died, I went to autozone and bought one off the shelf. Easy install and it runs fine.. I just went to take a look and the connectors are Black!!
I have a 74 f100

 

Did you bolt the box back onto the truck yet? It might need a ground from the truck?

 

These different ICMs get bolted to the left inner fenderwell.....there's the ground.
Most people who realized heat from the engine is the main nemesis of these modules will put a coupla washers (spacers) between the ICM and fenderwell.
That allows some air circulation and helps longevity of the ICM.

 

All of them have black connectors. What's different is the "grommet" which acts as a strain relief where the wires come out of the black goop on the underside. It may not be visable when the module is installed. Going by the color is the best way to be sure you get the correct one. My '74 has a '75 module. If I just go by year, it won't work.


Michael