1990 Miata Engine and Chassis Harness Separation Help. - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 03-06-2013, 10:31 PM   #1
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default 1990 Miata Engine and Chassis Harness Separation Help.

So guys, I need help separating the two and removing the engine harness. I have the factory wiring harness, but it seems as if a lot of things are tied together. Hell, I only need the lights to work. Everything else can GTFO. Can anyone give me some links to help me or offer any advice? I'm starting to get stumped. And if you are wondering why I am doing this, there is another power plant going in it.
85z28 is offline   Reply With Quote
Old 03-07-2013, 12:44 AM   #2
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

I found this diagram and the only thing questionable was the brake light, and that raises throttle, so it can be ditched. I guess what I am asking is can I simply trace all of these wires and get rid of them?
Attached Thumbnails
1990 Miata Engine and Chassis Harness Separation Help.-ecu_pin-out-1.6-miata.jpg  
85z28 is offline   Reply With Quote
Old 03-07-2013, 09:14 AM   #3
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

Bump?
85z28 is offline   Reply With Quote
Old 03-07-2013, 11:53 AM   #4
Senior Member
iTrader: (10)
 
Join Date: Jul 2009
Location: Oakdale, CA
Posts: 1,353
Total Cats: 66
Default

You'd be better off building a new body harness scratch, trying to separate the two is a major pain in the ***. If all you plan on keeping is the lights just make a new one, less wires, less cutting and soldering, not twenty years of road grime and sticky electrical tape.
RyanRaduechel is offline   Reply With Quote
Old 03-08-2013, 06:35 PM   #5
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

Is there a tutorial anywhere? I found out the NA cars have a complex box for turn signals. It would be nice to at least reuse the fuse box, relays, and flasher unit to cut costs.
85z28 is offline   Reply With Quote
Old 03-08-2013, 06:52 PM   #6
Junior Member
iTrader: (1)
 
Join Date: Jan 2009
Location: Bradenton, FL
Posts: 291
Total Cats: 5
Default

I recently did this on my 91. Mainly to scratch build a MS3X harness and get rid of the mound of wiring that isn't needed. I ended up using my own fuse box and tucking and Mil-spec'ing the entire harness in the process. Basically I just studied the wiring diagram and cut out what wasn't need then cut/extended/spliced as needed. I will tell you now it is easier to just cut all the grounds out in the beginning and rerun them when you are done. They are so intertwined in the harness it is impossible to sort it all out.
Sokool is offline   Reply With Quote
Old 03-08-2013, 07:27 PM   #7
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,926
Default

Quote:
Originally Posted by 85z28 View Post
Is there a tutorial anywhere?
Probably not, given that jobs of this nature tend to each be unique.

The best tool is simply a copy of the wiring diagrams from the factory service manual, and some patience. Here is the manual:

http://boostedmiata.com/servicemanua...vicemanual.pdf

Right-click, Save As.

As you will find, there is very little segregation of the various harnesses by function. The several harnesses join one another at the "Common Connectors", which are the ones denoted by an X, and are described in pages 1178-1180.
Joe Perez is online now   Reply With Quote
Old 03-08-2013, 08:18 PM   #8
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,780
Total Cats: 1,106
Default

Here is a link to where you can find just the wiring diagrams.
shuiend is offline   Reply With Quote
Old 03-09-2013, 02:07 PM   #9
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2011
Location: Tyler, TX
Posts: 254
Total Cats: 0
Default

Yeah guys, I have the diagrams and I am growing tired of this stuff. I ordered a universal chassis harness from keepitclean.com.
85z28 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
TunerStudio timining issue - 90 Miata 1.6 Turbo spec1sef MEGAsquirt 28 05-09-2017 08:03 AM
NEW-Wiseco Piston, K1 Rods, Supertech Valves & Spring/Retainer, TB&C pedals Rudes333 Miata parts for sale/trade 17 11-05-2015 02:16 PM
1995 OBD1 Un-cut Full Harness Joker Miata parts for sale/trade 0 09-17-2015 07:46 PM
Twitchy car (tail happy problem) bigben Race Prep 16 09-11-2015 04:41 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:13 PM.