Hello

There is a very large class of people that own 65/66 Mustangs that, as far as I can tell, anyway, have been, for the most part, ignored entirely. They don't really want that 100 pt. show car that is so nice and was soooo expensive that they're afraid to drive it, they also don't want to make their car capable of achieving warp factor three. They just want this car that they dearly love to be able to cruise around smoothly and reliably, without having it dump them out on the side of the road or have it start making weird noises or belching out big clouds of funky-smelling smoke. And I think, truth be told, that this is by far the largest class of Mustang owners. They take their car to some technician when what they actually need is a mechanic, and this, frequently, does not work out very well at all for the owner. They don't want to re-engineer the entire car, they just want someone to fix what broke. These are the people that I am trying help out with this blog. Some problems require a little bit of back and forth, as in, "Try this." "I tried that and it didn't change anything."
" Oh. well, you probably need to try that." " I tried that and it helped, but it still isn't quite right." "Now you need to try this...." If you go to http://www.allfordmustangs.com/ and then go to the classics forums, you will be able to do that with a pretty hefty gathering of some very knowledgeable people that also happen to be very friendly. None of that ridiculous one-upmanship, no flaming or abuse, none of that stuff. Just good, solid advice from people that know what they are talking about.

Saturday, March 7, 2015

1966 Mustang Gauge Harness connector

The 66 Mustang engine gauge harness connector, the big one that plugs into the main underdash harness through a big rectangular hole in the firewall, Has 8 bullet connectors in it. 6 of them are male and two of them are female. The two female connectors are numbers 4 and 8 in the drawing. Here is where all of those wires go. And yes, there are 9 wires coming out of those 8 connectors. The one with two wires coming out of it, #3, is made that way so that you can actually start your car. When the key is in the 'On' position, power goes through that red/green wire from the ignition switch out to the coil. However, when the key is in the start position, there isn't anything coming from the switch to coil, so, when you turn the key to start position, the coil isn't getting any power, which means that your car will just crank and crank, but never start.  When the key is in the start position, power goes from the ignition switch to the starter solenoid along the red/blue wire, which engages the starter solenoid. That makes two things happen. One, power goes straight from the battery to the starter through the main circuit of the solenoid, and, two, power leaves the solenoid along that brown wire that's plugged into the 'I' post on the front of the solenoid. Inside the firewall connector, that brown wire is spliced into the red/green wire that goes to the coil, so power goes from the solenoid to the firewall connector, then out to the coil along that red/green wire. This also a full 12V charge, instead of the 6 or 7V charge that comes to the coil from the ignition switch because of the resistor wire. The resistor wire is there to extend the life of the breaker points and the coil. If the coil was getting the full 12V all of the time, those components would fail a lot sooner than they have to. The full 12V while starting makes the car easier to to start.

2 comments:

Doug Styers said...

Hi Veronica,

Thanks for all you do for us as it is absolutely invaluable to us who do not know very much on these cars we have.
My Question here is it states 66 Mustang harness gauge connector. Is this and does this hold true for the 1965 base coupe mustnag turn signal wiring connector hook up.
Thanks,
Doug Styers

Veronica said...

Hi,Doug. That is very kind of you. :) It depends on a number of things. A 64 1/2 doesn't even have that connector, just a bunch of individual bullet connectors. On some of the 65s, the wire that goes out to the horns is yellow with a green stripe, instead of blue with a yellow stripe, like a 66. But, it is essentially the same. The turn signal and brake light wiring is the same on the 65s as it is on a 66.