MS1V3 Wiring harness horrors
 

Today I received a used Brain-built MS1V3 from a forum member here. Somewhere along the line, one of the previous owners of the unit absolutely mangled the 64-pin connector side of the harness. Everything appears to be connected, they are just poorly soldered and the joints are exposed. I have purchased a new 64-pin connector and I am now in the process of soldering everything to the new connector and confirming a few things.

First off, the DB37 connector appears to be untouched and looks exactly like the DB37 from Braineack's DIY thread:

https://www.miataturbo.net/attachmen...ine=1365200927

The first thing that concerns me is the ground wires on the 64-pin connector. The previous owner has one thick black wire connected to 2C and another thick black wire connected to 2A. 2D and 2B were left untouched. (Note that one of the black wires is connected to pins 7,8,9 and the other is connected to pins 17,18,19 on the DB37 connector, just like in the picture above.) Is this something I need to fix? According to Braineack's DIY thread, one wire should be split between 2C,2D and the other split between 2A,2B:

https://www.miataturbo.net/attachmen...ine=1365200927

Second, on my 64-pin connector, the wires connected to 1G and 1H are opposite of the picture above. I have a brown wire going into 1G and a GRN/WHT wire going into 1H. Is this something that was done to some of the units, or did the previous owner just mess up when soldering everything back to the connector?

Any input would be greatly appreciated!

That diagram is probably for a MS2, so leave the brown and g/w wire as installed on the harness; reverse from the picture.

grounds on the DB37 are: 1-2 and 7-19

I personally like to wire pins 1 and 2 to 4C and 4B, then two each on any other the others to 4A and 4B. Not using a big fat wires, so it would be 6 18g wires; if that makes sense.


Take caution when soldering the 64 pin, get a tab of solder on the pins and wires before merging them. use heatshrink wrap, then when you're finished coat it all in hot glue to really hold and support the wires to protect them from stress and vibrations so the they dont break off at the solder joint or pull out of the connector itself.


aim for this:

https://www.miataturbo.net/attachmen...ine=1365270987

then:

https://www.miataturbo.net/attachmen...ine=1349622045

I ran out of glue here, but build it up to like a full inch or so.

http://www.boostedmiata.com/gallery2...1/DSC_5646.JPG


Also I take great care in wiring the wires in order so they all line up pretty and nice.

Brain,

Did you mean pins 1 and 2 to 2C and 2D, respectively (2C and 2D being the two pins labeled 'SENSOR GROUND' in the diagram)? And then any two of pins 7-19 wired to 2A and 2B? Don't think I'm following where the 6 18g wires come from.

pins 1 and 2 to 2C and 2D each.

and 4 pins total from your pick of 7-19 going, two each, to 2A and 2B.

Okay I get it now, thanks Brain. Just curious, would it have worked the way the PO had it set up?