1973 F-350 Ignition Control Module Replacement
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3rd Gear
Joined: Oct 2023
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1973 F-350 Ignition Control Module Replacement
I recently acquired a 73 F-350 XLT. It's my first ever classic Ford truck and it's in really great shape. But I need to replace the old ignition control module. I looked all over the internet and can't find anything that's made for the year. Everything that's available is for 75 and newer models. Where can I find an ICM that's specifically made for a 1973 truck? Thanks in advance!
Moderator & parts slinger
Joined: Feb 2007
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From: S/W Missouri, Polk county
Welcome to FTE, DuraSpark ignition modules identified by a colored plastic insert located above where the wires feed out.
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
2 others: One has a redplastic insert, the other has a yellowor brownplastic insert.
Redmodule is D7AZ-12A199-Aused in some CA vehicles ONLY.
D9AZ-12A199-C(replaced D8AZ-12A199-A). One of these modules isyellow , 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 -blueinsert (Motorcraft DY-893) /Newest info: 1U2Z-12A199-AA(replaced D6AZ-12A199-A & B; D7AZ-12A199-B & D9VZ-12A199-A) .. Ignition Module-Blueplastic grommet (Motorcraft DY-893) / Availablefrom Ford.Original D6AZ-A & B; D7AZ-B; D9VZ modules marked: D6AE-12A199-A1Aor A1Bor A2Aor A2B// D8VE-12A199-A1Bor A1C or A2BorA2C
Myriad 1976/90's FoMoCo vehicles. Available from Ford dealerships (that have the old stuff still in stock). And from reproduction vendors and most auto parts stores carry them.
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.
To help you learn your truck and in case you did not get a owners manual. Owners manual free download. https://drive.google.com/file/d/0B9Y...J_jpVdqy9XQf6A
And when you set the park/emergency DO NOT EXPECT TO SEE A RED BRAKE LIGHT ON THE DASH COME ON.
Now when you 1st start the truck, the light will/should 1st come as a proof test, but should go out after a few sec. It is comes on any other time you can have a leak in the brake system or a faulty brake pressure switch wiring issue.
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
2 others: One has a redplastic insert, the other has a yellowor brownplastic insert.
Redmodule is D7AZ-12A199-Aused in some CA vehicles ONLY.
D9AZ-12A199-C(replaced D8AZ-12A199-A). One of these modules isyellow , 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 -blueinsert (Motorcraft DY-893) /Newest info: 1U2Z-12A199-AA(replaced D6AZ-12A199-A & B; D7AZ-12A199-B & D9VZ-12A199-A) .. Ignition Module-Blueplastic grommet (Motorcraft DY-893) / Availablefrom Ford.Original D6AZ-A & B; D7AZ-B; D9VZ modules marked: D6AE-12A199-A1Aor A1Bor A2Aor A2B// D8VE-12A199-A1Bor A1C or A2BorA2C
Myriad 1976/90's FoMoCo vehicles. Available from Ford dealerships (that have the old stuff still in stock). And from reproduction vendors and most auto parts stores carry them.
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.
To help you learn your truck and in case you did not get a owners manual. Owners manual free download. https://drive.google.com/file/d/0B9Y...J_jpVdqy9XQf6A
And when you set the park/emergency DO NOT EXPECT TO SEE A RED BRAKE LIGHT ON THE DASH COME ON.
Now when you 1st start the truck, the light will/should 1st come as a proof test, but should go out after a few sec. It is comes on any other time you can have a leak in the brake system or a faulty brake pressure switch wiring issue.
Lead Driver
Joined: Oct 2018
Posts: 7,876
Likes: 2,364
That is a durashart box, not original on your pickup but that's fine. get one for a later 70's model it should fit, might require some modifications to the plugs who knows how they did the conversion.
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3rd Gear
Joined: Oct 2023
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Thanks for the info @440 sixpack
Any idea why someone would convert the points system to a Duraspark module? Is the Duraspark more or less reliable? Thanks again!
Any idea why someone would convert the points system to a Duraspark module? Is the Duraspark more or less reliable? Thanks again!
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Fleet Mechanic
Joined: Feb 2022
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They were supposed to be more reliable, but they suck. Just search through this forum and you’ll find out. GM got it right with HEI. Ford screwed the pooch.
My opinion, get a new PerTronix distributor for $325 and you’ll be done without ever having to worry about it for a very long time. Two wires and you’re done. It will clean up your engine compartment too since you’ll be able to delete a lot of the rat’s nest of wiring that comes with the factory Ford ignition systems.
Go with a one wire alternator and you’ll be in even better shape.
My opinion, get a new PerTronix distributor for $325 and you’ll be done without ever having to worry about it for a very long time. Two wires and you’re done. It will clean up your engine compartment too since you’ll be able to delete a lot of the rat’s nest of wiring that comes with the factory Ford ignition systems.
Go with a one wire alternator and you’ll be in even better shape.
Lead Driver
Joined: Oct 2018
Posts: 7,876
Likes: 2,364
Nothing is more reliable than points, but electronic ignition has it's advantages.
I like the durashart but the boxes can and will fail, just carry and extra and you're good. they're far better than any of the aftermarket imported crap as far as I'm concerned and they look original even in your older Ford.
I like the durashart but the boxes can and will fail, just carry and extra and you're good. they're far better than any of the aftermarket imported crap as far as I'm concerned and they look original even in your older Ford.
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,186
Likes: 5,792
From: S/W Missouri, Polk county
And if you get to carry a spare IG module, make sure it is stored with the black stuff facing UP and NOTHING is on top of it. When it gets hot in the tool box or glove box that black stuff turns into a gooey mess.
Hotshot
Joined: Feb 2004
Posts: 10,805
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From: The Shenandoah Valley
Points work, they just require occasional replacement and gap settings.
My '77's original Motor Craft ignition box started acting up about 10 years ago one hot afternoon after work, about 5 minutes after starting it, but a still cold coke doused on it got me to home. POS only lasted about 35 years.
My then spare (an off brand bought cheap at a trucking company's wreck salvage store) carried since the '80s had melted it's guts in the box it came in, but it worked when cold water wouldn't. Now I carry a gooder spare placed up side down in a box so that it's guts will stay inside.
My '77's original Motor Craft ignition box started acting up about 10 years ago one hot afternoon after work, about 5 minutes after starting it, but a still cold coke doused on it got me to home. POS only lasted about 35 years.
My then spare (an off brand bought cheap at a trucking company's wreck salvage store) carried since the '80s had melted it's guts in the box it came in, but it worked when cold water wouldn't. Now I carry a gooder spare placed up side down in a box so that it's guts will stay inside.
Cargo Master
Joined: Jul 2005
Posts: 2,310
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From: Kansas
Fleet Mechanic
Joined: Feb 2022
Posts: 1,370
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I guess that’s the problem with anecdotal evidence. I never had one fail, but that’s only my experience. Obviously your mileage may vary.
If you had the later model small cap HEI with the remote mounted coil it was never a problem to remove the cap, even with cowls that hung all the way over the distributor. If you had a large cap with the contained coil, well then yeah, that could be a pain.
The good thing is that if the OP goes with the PerTronix distributor, he gets the best of many worlds. More reliable system, compact design, ease of installation, eliminates a mess of wiring, and if you have to replace that module the distributor is on the correct side of the engine. Easy like Sunday morning.
If you had the later model small cap HEI with the remote mounted coil it was never a problem to remove the cap, even with cowls that hung all the way over the distributor. If you had a large cap with the contained coil, well then yeah, that could be a pain.
The good thing is that if the OP goes with the PerTronix distributor, he gets the best of many worlds. More reliable system, compact design, ease of installation, eliminates a mess of wiring, and if you have to replace that module the distributor is on the correct side of the engine. Easy like Sunday morning.
Fleet Mechanic
Joined: Feb 2022
Posts: 1,370
Likes: 706
OP: On the other hand, if you want to go back to points for some reason I have a perfectly working distributor out of a 73 250 that I would love to see going to a good home where it will actually be used. Original stuff off Papa’s old truck is keeping at least three trucks around here factory accurate and going strong. It’s yours if you want it free of charge.
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