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<blockquote data-quote="OX1" data-source="post: 16811466" data-attributes="member: 175132"><p>What year and what alternator. 2G alt wiring was suspect when it left the factory</p><p>(I'm assuming you have 2G, since you talked about dual wiring). Those would be the black and orange wires here (86 EFI alt wiring).</p><p></p><p><img src="http://luxjo.supermotors.net/CAPRI/3G%20ALTERNATOR/86%20CHARGING%20POWER.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p> Here is typical EEC and starting circuit wiring. Looks like EEC grounds EEC relay to actuate it off pin 60. The other side of that, does run right back to the alt (and then a fusable link between it and ign switch).</p><p></p><p> Also, EEC power, pin 37 has another fusable link on input side of EEC relay that is supposed to be hot at all times.</p><p></p><p> I would start in and around the EEC power circuit and relay, you can usually "back feed" the EEC or relay harnesses to measure voltages without disconnecting anything.</p><p></p><p><img src="http://www.veryuseful.com/mustang/tech/engine/images/Mustang-86-Mustang-ECC-EFI.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="OX1, post: 16811466, member: 175132"] What year and what alternator. 2G alt wiring was suspect when it left the factory (I'm assuming you have 2G, since you talked about dual wiring). Those would be the black and orange wires here (86 EFI alt wiring). [IMG]http://luxjo.supermotors.net/CAPRI/3G%20ALTERNATOR/86%20CHARGING%20POWER.jpg[/IMG] Here is typical EEC and starting circuit wiring. Looks like EEC grounds EEC relay to actuate it off pin 60. The other side of that, does run right back to the alt (and then a fusable link between it and ign switch). Also, EEC power, pin 37 has another fusable link on input side of EEC relay that is supposed to be hot at all times. I would start in and around the EEC power circuit and relay, you can usually "back feed" the EEC or relay harnesses to measure voltages without disconnecting anything. [IMG]http://www.veryuseful.com/mustang/tech/engine/images/Mustang-86-Mustang-ECC-EFI.gif[/IMG] [/QUOTE]
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