Eduardo Santos

So at the moment I'm repairing my 1987's Mazda RX-7 FC S4 harnesses (because someone in the past messed them up a lot) and I was looking at the FSM's wiring diagrams when I noticed that they don't seem to indicate the path that the wires follow.

I looked at the diagrams but I don't know / understand if all terminals of same color should be connected between themselves or if there should be separated wires connecting each one, and if that's the case, from where to where should they connect?

I don't know how to explain my doubt better than this so I'll give you an example:

On the «Instrument Panel Harness» (section 50 page 118 of the FSM)

(I've changed it a bit so you can understand more easily)
There are several Red wire terminals along several different connectors (I've counted 4 "red terminals" along 3 different connectors). How should they be connected? Is the "red terminal" on "To Front Harness A" connector, connected to both "red terminals" on the "Warning & auto clock unit" connector, and then connected also to the "red terminal" on the "To Front Harness B" connector with just one red wire? Or, is it the "red terminal" on the "To Front Harness A" connected to the leftmost "red terminal" on the "Warning & auto clock unit" by one red wire, and then the rightmost "red terminal" of the same connector, connected by another red wire to the "red terminal" on the "To Front Harness B" connector? Or is it the rightmost "red terminal" on the "Warning & auto clock unit" connector that connects via one red wire to the "To Front Harness A" connector, and then the leftmost "red terminal" on the "Warning & auto clock unit" connector connects via another red wire to the "To Front Harness B" connector?
The same doubt arises when I looked at the Green and Black "terminals" because the are several of those. I didn't even looked at the other ones because I'm sure I'll have the same doubt.

Can someone please explain / teach me?

clokker

iTrader: (2)

You can't use that as a wiring diagram and I'm not sure exactly what info it's trying to impart (maybe some sort of general idea of how the harness is laid out?).
Whatever it is, t'aint nuttin like the S5 FSM diagrams.

satch

iTrader: (1)

It's easier to break down what connects to what by looking at each individual diagram related to the diagram you posted. For example, there is a plug in the diagram in which you provided which is labeled "Warning and Auto Clock Unit." If you look over that particular diagram it shows two Red wires connecting to the warning unit, but it shows which plug each wire runs to. In this example, one Red wire runs to FI-02 which is a connector that mates the front harness w/the instrument harness and the other Red wire, if it exists, if for the A.B.S. system and it runs to FI-01 which is a completely different connector than the other Red wire previously mentioned, which happens to relate to the Brake Warning Light. Below this diagram it will show the respective plugs and their color coded breakdown so you won't be confused as to where each respective wire goes to.

TonyD89

iTrader: (10)

It's a harness diagram. Not a wiring diagram. I think that is what satch is saying. The wires shown on the main connector should be found on one of the other connectors but not all the colored wires on that connector come from the main harness connector. You need to find out which particular wire you need to follow.

In other words, what are the labels on the main harness for the red, green, black wires?

Eduardo Santos

I agree with you. So far I've realized that S5 FSM tends to be more complete and accurate than the S4 one. Also the S4 diagrams are a bit more biased to the Turbo version than to the N/A.
You made me notice that indeed I was trying to use a harness diagram as if it was a wiring diagram, which is not. Thank you for that


I understood your explanation!
I've realized now that the second red wire (the one from the ABS) should be indeed a black/red wire (because my car doesn't have ABS).
Thanks to your explanation I now understand how I should proceed with the wires!
Thank you!


I understand now. Thank you!