I'm about to kill this thing (gauges not working) - 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 08-30-2009, 10:33 PM   #1
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default I'm about to kill this thing (gauges not working)

So.. 6 months of downtime and a lot of money's later.. My car is running with a rebuilt motor on MS and I'd love to drive it.

However, my gauge cluster gauges aren't working (don't know about speedo, but it's cable driven so I'm sure it does) The tach, op gauge, fuel gauge, and water temp gauge all have the same power and ground source, so I'm thinking that's gotta be it.

This is where it gets weird, I check ground at 2J on the connector on the back of the gauges, ground is good. I check power, no power, ok I think im getting somewhere.

Next I check the fuse, it's good, check power on both sides of the fuse (this is the meter fuse btw) power on both sides of the fuse. So I'm thinking it must be a cut wire or something..

I kill power, ohm out between 2K and the fuse, I have .3 ohm, WTF? I check for power again, and again I have it at the fuse and not at the connector.

So, I troubleshoot electrical systems on aircraft everyday at my job, and I'm feeling like an idiot, plus it's like 115 in my garage right now and I may be delerious (sp?) but can anyone think of what could be causing this besides my own stupidity?

Thanks

P.S. 1990 miata, haven't done any wiring in relation to the gauges
greenday3437 is offline   Reply With Quote
Old 08-30-2009, 10:45 PM   #2
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

hmm did you build your own MS in parralel? i would suspect the MS before i suspected something i hadnt touched.
magnamx-5 is offline   Reply With Quote
Old 08-30-2009, 10:56 PM   #3
I'm a terrible person
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

I haven't really looked at any schematic for the Miata.. but if you can ohm out the wire from the gauge to the fuse.. you should get power. So I don't see how you are not getting power unless there is something between the gauge and the fuse that is opening the circuit when there is power.

Have you tried running your own wire from the fuse to the gauges?

Any one have a e-copy of the wiring diagram for the gauges?

It's been a while since I've done any electrical diagnosis, but hopefully I don't sound like a retard and something I said helps.
FRT_Fun is offline   Reply With Quote
Old 08-30-2009, 11:14 PM   #4
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by FRT_Fun View Post
I haven't really looked at any schematic for the Miata.. but if you can ohm out the wire from the gauge to the fuse.. you should get power. So I don't see how you are not getting power unless there is something between the gauge and the fuse that is opening the circuit when there is power.

Have you tried running your own wire from the fuse to the gauges?

Any one have a e-copy of the wiring diagram for the gauges?

It's been a while since I've done any electrical diagnosis, but hopefully I don't sound like a retard and something I said helps.
You are right that I should have power, that's what's so confusing for me. I'm going to try to run my own wire tomorrow just to see if that fixes it. Here are the schematics: http://www.madracki.com/miata/images/wiring/90diag.pdf

Magna, I did build my own MS, however I dont think these gauges have anything to do really with the wiring that I touched over there, also it was doing this before I installed the MS (when I was running it off of the factory ECU)
greenday3437 is offline   Reply With Quote
Old 08-30-2009, 11:36 PM   #5
Senior Member
iTrader: (6)
 
Join Date: Jul 2007
Location: Cocoa Beach, FL
Posts: 808
Total Cats: 3
Default

check the power to ground, maybe it's grounding out
TrickerZ is offline   Reply With Quote
Old 08-30-2009, 11:43 PM   #6
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by TrickerZ View Post
check the power to ground, maybe it's grounding out
Not really sure what you mean, check power using the power pin for power and the ground pin suppied to the cluster for ground? that's what I've been doing if that's what you mean
greenday3437 is offline   Reply With Quote
Old 08-31-2009, 12:04 AM   #7
Senior Member
iTrader: (6)
 
Join Date: Jul 2007
Location: Cocoa Beach, FL
Posts: 808
Total Cats: 3
Default

check the resistance between power and ground at the cluster. You said you checked continuity in the wire, and voltage at the wire, but didn't say if you checked to make sure the wire wasn't grounded.
TrickerZ is offline   Reply With Quote
Old 08-31-2009, 01:00 AM   #8
I'm a terrible person
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

True, the wire coming from the meter fuse and going to 2k could be grounding out somewhere.
FRT_Fun is offline   Reply With Quote
Old 08-31-2009, 01:20 AM   #9
Senior Member
iTrader: (14)
 
Join Date: Aug 2007
Location: Buffalo, NY
Posts: 734
Total Cats: 1
Default

Had a similar problem with my '94. Solution to my issue is my build thread... https://www.miataturbo.net/forum/t34619/#post416876
deliverator is offline   Reply With Quote
Old 08-31-2009, 10:16 AM   #10
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by FRT_Fun View Post
True, the wire coming from the meter fuse and going to 2k could be grounding out somewhere.
That's true, but I assumed that it would pop the fuse almost instantly if it had grounded out.
greenday3437 is offline   Reply With Quote
Old 08-31-2009, 10:21 AM   #11
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by deliverator View Post
Had a similar problem with my '94. Solution to my issue is my build thread... https://www.miataturbo.net/forum/t34619/#post416876
H'mm im assuming these connectors you found on the passenger side were signal wires from the sensors, do they all run through the same connector?

I'm not sure if the 94 is the same as the 90 in that regard, I'll have to look, but I hadn't even though of that. thanks
greenday3437 is offline   Reply With Quote
Old 08-31-2009, 11:14 AM   #12
Senior Member
iTrader: (6)
 
Join Date: Jul 2007
Location: Cocoa Beach, FL
Posts: 808
Total Cats: 3
Default

Quote:
Originally Posted by greenday3437 View Post
That's true, but I assumed that it would pop the fuse almost instantly if it had grounded out.
You would think, but the only other explanation is that what you were testing against wasn't actually a ground.
TrickerZ is offline   Reply With Quote
Old 08-31-2009, 12:18 PM   #13
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Quote:
Originally Posted by TrickerZ View Post
You would think, but the only other explanation is that what you were testing against wasn't actually a ground.
I'm pretty sure it was but you never know.. I'm about to go out there with a level head and see if I can figure this thing out.
greenday3437 is offline   Reply With Quote
Old 08-31-2009, 01:44 PM   #14
Junior Member
 
Join Date: Nov 2008
Location: San Diego
Posts: 65
Total Cats: 0
Default

Seal that garage up tight and put an AC in there for god sake. 115F is way to hot to be working in. Then check the switched power on 1i and also the ground on 2d. Gauges look like simple anlog curcuits and could be verified with a direct connection the the gauge itself. hope this helps out.
LowBoostn is offline   Reply With Quote
Old 08-31-2009, 11:32 PM   #15
Senior Member
Thread Starter
iTrader: (2)
 
Join Date: Aug 2005
Location: Granbury, TX
Posts: 567
Total Cats: 1
Default

Well those of you curious.. It was the power wire just like I and everyone else was saying.. Not exactly sure where it's messed up, but I ran a wire off the fuse to the gauges just to see if it fixed it, and it did..

So I removed the factory wire and more permanently put that new wire in, problem fixed now.. Thanks everyone

Just as I finished everything else up, got all ready to drive it, I realized two things.. One, my reverse lights don't work, Im thinking I possibly could have forgotten to hook up the wires when putting the engine and tranny in, but I dont think so, maybe wiring I hope not.

Second, what actually prevented me from taking it on it's maiden voyage is that my radiator cap is MIA, so I gotta go pick up a new one tomorrow.
greenday3437 is offline   Reply With Quote
Old 09-01-2009, 12:43 AM   #16
I'm a terrible person
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

Ouch, that is a horrible thing to keep you from driving your car!

Glad to here the gauge cluster is up and running.

The wires for the reverse lights that go to the tranny were horrible for me when getting my car back together. I ended up just cutting the wires and putting in some easy to disconnect connectors.
FRT_Fun is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
MS PNP requires reading and following directions??? satisfied MEGAsquirt 141 10-06-2015 11:44 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM
WTB parts for HPDE car Voltwings WTB 5 09-11-2015 09:23 AM
Project DDoS: '99 "Budget" boost build ProjectDDoS Build Threads 1 09-09-2015 02:52 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 01:30 PM.