NCross

iTrader: (18)

Car is a 79 model. Manufactured date is 9-78.

I just installed a new wiring harness from a 79. I'm unsure of the trim level, build date etc. Only difference I'm seeing is that the engine wiring harness is arranged differently. I can redo that no problem. I'm only running the coolant sensor and the alternator itself, no emissions. The problem is that the large black plug with the large black wire ( positive to alt.) and 14ish gauge white with black stripe wire is different. (what is this for?)

Let me try to make this clear...

-The original engine harness is on the car.
-The NEW main harness is on the car.

-The original engine harness has the large black plug with a large black positive wire and a 14ish gauge white with black stripe wire. It's all one plug, but the black wire is a standard blade plug, and the white with black stripe wire is a bullet. Both wires share the same plug again.

-The NEW main harness only has the large black wire and no white with black stripe wire to be seen. In fact the plug on this harness is completely different. It is a single standard female blade plug. I'm not worried about this too much, it just goes to the positive terminal on the alternator. It slides right into the notch on the stock engine harness.

What I am worried about is where is the white with black stripe wire supposed to source from? It comes from the alternator to the tip of the large black plug, but is it supposed to tap into something? I read that one wire is supposed to control some dash lighting and one is for the voltage gauge.

Is there a hidden loose bullet plug I'm over looking?

Let me know if you need pictures as this confuses me too!

7aull

iTrader: (2)

Pix are good. Do you have a 79 OEM wiring manual??? Never heard of Mazda swapping in new wires or connector-types within a model yr production run. Assume its not possible your new MAIN harness isn't off a 1980?? because the 80 does have a diff wiring for Alt I believe, and certainly a diff dizzy...
Stu Aull
80GS
Alaska

NCross

iTrader: (18)

It has to be from a 79 because it has points resistor packs (or it did until I wired my 2gdfis up).

Could it be an automatic harness?

NCross

iTrader: (18)

You can see the male end of the alternator plug is different. What I need to know is where does this white wit black stripe wire go? I cut it off the original plug and tapped it into the same colored wire on the next harness. Now, where does the white wire and black with green stripe wire go? Shown on the right of the bottom picture. They're just sitting there with nowhere to plug up now. You can see that I matched up the other wires to their corresponding colored wire on the other harness, but the plug was arranged differently so I had to use my own connectors. Now there is no white wire and no black with green stripe wire to match up to the engine harness.

I think the 3rd unused wire is just a ground. It's black.