Electrical question - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 05-09-2010, 03:32 PM   #1
Senior Member
Thread Starter
iTrader: (12)
 
absRTP's Avatar
 
Join Date: Sep 2009
Location: Montreal, Canada
Posts: 582
Total Cats: 0
Default Electrical question

Hi everybody, I just finished rebuilting my b6ze short nose of my 1990 and I have a problem now, everytime I plug my battery the main fuse (80amp) blows....

I tried removing all the fuse from the fuse box, it still blows....

the main wire from the battery to the main fuse is fine, no short on this one

But I have a question, when I reinstalled my wire at the back of the engine, I got confused about 2 black wire with orange strips, I don't if both really need to be connected to the intake manifold






so, that mean I have a live wire that is grounding itself somewhere....

I already check the alternator and starter, now I'm gonna try it without the alternator plugged in, then without the starter.......

Does anybody would have an idea about what this could be....

Plus, whats are the white live wires that coming out of the fuse box, just after the main fuse

thanks

-Marc-André
absRTP is offline   Reply With Quote
Old 05-09-2010, 04:55 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,915
Default

Quote:
Originally Posted by absRTP View Post
But I have a question, when I reinstalled my wire at the back of the engine, I got confused about 2 black wire with orange strips, I don't if both really need to be connected to the intake manifold
Interesting, I've never seen those wires with orange stripes on them. Usually they're just black. For what it's worth, your ground points could use some cleaning.

There are two ring-terminal grounds that attach back there, each terminal having two wires:





Quote:
I already check the alternator and starter, now I'm gonna try it without the alternator plugged in, then without the starter.......

Does anybody would have an idea about what this could be....
You've got a meter, which is a great tool. Measure for continuity between the various wires and ground. Also, remove the wire that you accidentally crushed between the valve cover and the head and/or between the engine and transmission.



Quote:
Plus, whats are the white live wires that coming out of the fuse box, just after the main fuse
White wires go to the ignition switch and the alternator.



There's also a jumper to the 40A BTN fuse, the 30A Cooling Fan fuse, the 20A AC fan fuse, the 60A ABS fuse, the 10A Airbag fuse, and probably one or two others that I've forgotten.
Joe Perez is offline   Reply With Quote
Old 05-09-2010, 11:27 PM   #3
Senior Member
Thread Starter
iTrader: (12)
 
absRTP's Avatar
 
Join Date: Sep 2009
Location: Montreal, Canada
Posts: 582
Total Cats: 0
Default

I don't remember having crushed any wire.... but I'll check for continuity tomorrow
absRTP is offline   Reply With Quote
Old 05-09-2010, 11:41 PM   #4
I'm Miserable!
iTrader: (1)
 
Join Date: Mar 2010
Location: North Carolina
Posts: 471
Total Cats: 0
Default

Do check to make sure you havent pinched a wire or any part of the harness in the bellhousing, this seems like a simple "cant miss" type of thing but I was putting my transmission back in yesterday and caught the side of the harness in the bellhousing and immediately got smoke pour out of the engine bay (underneath the intake manifold area) from a power wire being grounded out. Luckily I got it out before anything caught on fire.

Sorry I couldnt be of more help
na8psi is offline   Reply With Quote
Old 05-10-2010, 07:00 PM   #5
Senior Member
Thread Starter
iTrader: (12)
 
absRTP's Avatar
 
Join Date: Sep 2009
Location: Montreal, Canada
Posts: 582
Total Cats: 0
Default

OK, no more problem with a live wire beeing grounded, I check every plug under the fusebox and now the battery is pluged in, but when I turn the key, I ear one thick (from the starter I guess) but nothing else.... and the engine wont turn
absRTP is offline   Reply With Quote
Old 05-10-2010, 08:35 PM   #6
Senior Member
iTrader: (23)
 
Join Date: Oct 2009
Location: Chatsworth, SoCal
Posts: 948
Total Cats: 1
Default

So what happened? What wire are you talking about? In order for us to help you you need not be so vauge. We need to know if you F*#&ed up and or what happened.

It's like going to the doctors and saying I need help. When he askes whats wrong telling him that your stomach hurts without giving him you ate 2lbs of candy. You need to give any and all info.

Have a great day,
Jared
Jfornachon is offline   Reply With Quote
Old 05-10-2010, 08:55 PM   #7
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,915
Default

Quote:
Originally Posted by absRTP View Post
OK, no more problem with a live wire beeing grounded, I check every plug under the fusebox and now the battery is pluged in, but when I turn the key, I ear one thick (from the starter I guess) but nothing else.... and the engine wont turn
That one tick is more likely from one of the solenoids or relays in the car. Possibly the fuel pump, I honestly can't remember if the stock ECU primes it at key-on.

The starter should not tick simply from the key being moved to "Run." Or did you mean that the starter ticks when you turn the key to "Start"?


Everything you need to troubleshoot the starter is on the image I posted above. It's a no-brainer of a circuit. You turn the key to "Start" and voltage shows up on the black/blue wire. You depress the clutch to the floor, closing that switch, and voltage then shows up on the black/red wire, which is the one that shows up at the starter on an insulated 1/4" flat terminal.

So that's one test. When you turn the key and depress the clutch, do you get +12 on that black/red wire at the starter?

That, of course, isn't the main starter power. That wire just causes the starter solenoid to operate. The solenoid, in addition to pushing the pinion gear out into position, also functions as a relay. When you apply voltage on the blk/red wire and the plunger with the gear pushes out, it also closes a contact which allows current from the big black wire to flow through to the starter motor, and that's what actually powers it.

So that's test #2: is there +12 at the big black wire on the starter, the one with a ring terminal on it?


Stupid question time: When you re-installed the motor, did you remember to hook up the ground strap? There are two of 'em, actually. One on the exhaust side of the engine, and another on the Powerplant Frame, under the car, back towards the diff.


And of course, do tell us what you did to fix the short circuit problem!
Joe Perez is offline   Reply With Quote
Old 05-10-2010, 09:52 PM   #8
Senior Member
Thread Starter
iTrader: (12)
 
absRTP's Avatar
 
Join Date: Sep 2009
Location: Montreal, Canada
Posts: 582
Total Cats: 0
Default

for the sshort circuit problem, I took off the fuse box from the car, removed every wire under it, untwist them all, the were all twisted together, somebody might have turn the fusebox on itself before I got the car, I also disconnect the wire at the battery (the ground that goes to the fender)

and tonight, I bought 2 new brass battery terminal, and the battery is on the charge for the night, it had a bad time for sure, it get shorted 3 times for over 80 amps

Thanks Joe Perez, I'm gonne take a look at this tomorrow ;-)
absRTP is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Buzzing from driver side of engine bay? (MS3 install) nick470 MEGAsquirt 7 06-16-2017 02:53 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
NA Seat Sliders and Seat Belt Receivers skipstr Miata parts for sale/trade 2 09-28-2015 11:53 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 04:29 AM.