Q: Ignition Wire for Killswitch identification help - 95 Thunderbird 3.8L V6 - TCCoA Forums
 
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post #1 of 10 (permalink) Old 08-16-2011, 03:52 PM Thread Starter
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Q: Ignition Wire for Killswitch identification help - 95 Thunderbird 3.8L V6

Hi:
I've finally gotten around to installing the killswitch on my "track car" for the 24 Hours of Lemons. The ignition switch has been detached from the key so I have easy access to the wires behind it.

Q: Which wire to I attach the switch on so that disconnecting it will kill the power to the ignition coil?


Here's what I found so far:
1) The best example I found was from this car alarm website. Two wires are listed as Ignition 1 and Ignition 2
red/light-green
black/light-green wires
http://www.commandocaralarms.com/wir...bird/1804.html

2) Autozone.com's wiring diagram shows black/light-green being connected to the wiper motor and red/light-green being connected to the alternator (they call it the "generator".)



This means the red/light-green is the wire I want to have the kill-switch interrupt, right?


NOTE: I will also appropriately connect the kill switch to disconnect the battery (2 GA wire) and shunt any stray voltage from the alternator through a resistor to ground (12gauge wire, more than enough for the 11W the resistor is rated to discharge).

Thanks in advance for your help.
Regards,
-g

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post #2 of 10 (permalink) Old 08-23-2011, 11:51 AM Thread Starter
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Anyone?
-g

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post #3 of 10 (permalink) Old 08-23-2011, 12:15 PM
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It's red and light blue. Car wont start without it.

I love my V8, but I'd love it more if all 8 cylinders worked. (they do now)

My T-bird is like George Jetson's wife, you try to give her a little money, she takes the whole wallet.
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post #4 of 10 (permalink) Old 08-23-2011, 01:27 PM Thread Starter
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Quote:
Originally Posted by 1996Project-bird View Post
It's red and light blue. Car wont start without it.
More importantly, will the car die if the line is interrupted?
Thanks,
-g

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post #5 of 10 (permalink) Old 08-23-2011, 01:30 PM
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Quote:
Originally Posted by S4gunn View Post
More importantly, will the car die if the line is interrupted?
Thanks,
-g
Its only activated when you turn your key to the START position .. it goes directly to the starter, and you only use that for one second when you start the car, after that its disabled anyways.

You need to kill a circuit on the RUN position. The Red / Light green might work.
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post #6 of 10 (permalink) Old 08-23-2011, 01:51 PM
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Quote:
Originally Posted by S4gunn View Post
More importantly, will the car die if the line is interrupted?
Thanks,
-g
It will not. Try making a fuel kill.

I love my V8, but I'd love it more if all 8 cylinders worked. (they do now)

My T-bird is like George Jetson's wife, you try to give her a little money, she takes the whole wallet.
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post #7 of 10 (permalink) Old 08-23-2011, 02:23 PM
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Why not disrupt power to the coil?

Will

The Texas Green Bird (An undeveloped work of art.)
92 Thunderbird Sport 5.0: Sold

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post #8 of 10 (permalink) Old 08-23-2011, 03:24 PM
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Quote:
Originally Posted by Roadrunnner View Post
Why not disrupt power to the coil?
That would be the Red / Light green wiring ... all goes to the #3 Fuse. The diagram above is missing the part where it branches off before going to the Alternator.
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post #9 of 10 (permalink) Old 08-23-2011, 03:34 PM Thread Starter
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Quote:
Originally Posted by SCTbird1994 View Post
That would be the Red / Light green wiring ... all goes to the #3 Fuse. The diagram above is missing the part where it branches off before going to the Alternator.

Thanks, Dan.
Since the killswitch is in the cabin, I was hoping to find the wire in the cabin that I could interrupt. I'll try with the red/lt-green wire. If not, I'll reconnect that wire and cut it right at the alternator (where I know it should cause the car to die).

As for the suggestion about a fuel cut. While the Lemons rules don't give a specific guideline other than the car must die when running at 3000 RPM, anecdotal comments on their forum say that the engine must die within 3 sec of the switch being flipped in order to pass tech inspection.

I have a fuel cut in the car now (rewired the internal switch to the main switch panel) and I'm 99% sure that it takes longer than 3 sec for the car to sputter and die.


-g


-g

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post #10 of 10 (permalink) Old 08-27-2011, 12:21 PM Thread Starter
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As SCTbird94 commented and I initially thought, interrupting the red/lt-green wire will kill the power to the ignition coil. I should have the killswitch installed shortly and will be one step closer to racing in Oct!
-g

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Last edited by S4gunn; 08-27-2011 at 01:00 PM.
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