Spktyr Posted April 8, 2018 Share Posted April 8, 2018 Hi there - I was referred over here by miesk5 over on FullSizeBronco.com. I'm trying to help a friend of mine with a 1985 Bronco with the 300/4.9L I6; the previous owner butchered the engine bay wiring pretty badly. We've decided to replace the EEC-III computer controlled carb with a conventional Carter YF and installed a DUI 'one wire' distributor/ignition system. I'm looking for information from the 1985 EVTM as to what wires I can remove/abandon as no longer needed and what wires I need to run the engine instrument gauges. Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 8, 2018 Share Posted April 8, 2018 I’m very sure you can post anywhere now, but let me know if not. As for the EVTM, the 85 is essentially the same as the 86, which I have here: http://www.garysgaragemahal.com/1986-evtm.html. I’m out and about, but will check back later to see what else you need. Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 8, 2018 Share Posted April 8, 2018 Ok, I've compared the two pages (56 & 57) of the 1985 EVTM that deal with the EEC for the 4.9L with the same pages (56 & 57) of the 1986 EVTM that I have online. And they are essentially the same, so you can use the 1986 pages to plan your removal work. My experience with a 1982 that had basically the same EEC-III system and feedback carb was that all of the EEC circuitry was stand-alone. In other words, each sensor for the EEC served only the EEC. So I was able to separate the EEC wiring and remove all of it, leaving just the basic wiring. Similarly, the pages on the fuel tank selector and gauges are essentially the same for the 4.9L. The only issue is that in '86 the idiot lights had been discontinued but they were offered in '85. So if your friend's truck has idiot lights you need to refer to Page 56 in the 1981 EVTM. But if I'm missed something please let me know. Link to comment Share on other sites More sharing options...
Spktyr Posted April 8, 2018 Author Share Posted April 8, 2018 Ok, I've compared the two pages (56 & 57) of the 1985 EVTM that deal with the EEC for the 4.9L with the same pages (56 & 57) of the 1986 EVTM that I have online. And they are essentially the same, so you can use the 1986 pages to plan your removal work. My experience with a 1982 that had basically the same EEC-III system and feedback carb was that all of the EEC circuitry was stand-alone. In other words, each sensor for the EEC served only the EEC. So I was able to separate the EEC wiring and remove all of it, leaving just the basic wiring. Similarly, the pages on the fuel tank selector and gauges are essentially the same for the 4.9L. The only issue is that in '86 the idiot lights had been discontinued but they were offered in '85. So if your friend's truck has idiot lights you need to refer to Page 56 in the 1981 EVTM. But if I'm missed something please let me know. Thanks. I believe that it does have idiot lights so I will download the appropriate page. Link to comment Share on other sites More sharing options...
Gary Lewis Posted April 9, 2018 Share Posted April 9, 2018 Thanks. I believe that it does have idiot lights so I will download the appropriate page. Good luck and let us know how it goes. Link to comment Share on other sites More sharing options...
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