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A Switched Positive Wire Under the Hood?

 
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Old 02-18-2009, 06:26 PM
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Icon5 A Switched Positive Wire Under the Hood?

I'm still looking for the "Blue Tac Test Wire" on my 00 Lude and am wondering if anybody knows where I can find a (+) Positive that's only hot when the car is running?

Obviously finding a Ground point won't be a problem, there must be 3,000 of them under the hood...LOL

I spoke with Raptor Tech and he told me that the reason they advise not hooking directly to the coil plug is because the coil emits "RF" as it operates that may interfere with the light's behavior and or accuracy.

So my search continues....

Any help or advice would be appreciated.

Thanks, V1
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Old 02-18-2009, 07:19 PM
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Re: A Switched Positive Wire Under the Hood?

what are you trying to wire in.
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Old 02-18-2009, 07:38 PM
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Icon5 Re: A Switched Positive Wire Under the Hood?

I'm wiring up a shift light.

I've got a 3 wire harness coming out of a Raptor shift light.

The Green wire reads the rpms / tac signal, the Red wire has to be connected to a switched (+) when the car is running, and the Black wire goes to ground.

I'd like to locate the "Blue tac test wire" on my 2000 Prelude VTEC.

Sure would make hooking this shift light up simple.

Thanks, V1
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Old 02-19-2009, 12:21 AM
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Re: A Switched Positive Wire Under the Hood?

i don't know if the 5th gen has the plug...
The 4th gen(92-96) does tho

Have you looked thru a service manual for your car?
If they suggest against using it str8 from the coil, just use a service manual and find the tach wire behind the cluster.
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Old 02-19-2009, 12:47 AM
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Re: A Switched Positive Wire Under the Hood?

You're absolutely right about the coil. I just got my FSM in the mail yesterday so I've got lots of wiring diagrams to look through. I just thought maybe someone who's done this could save me some research time.

Thanks, V1
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Old 02-19-2009, 01:03 AM
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Re: A Switched Positive Wire Under the Hood?

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Old 02-19-2009, 01:11 AM
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Re: A Switched Positive Wire Under the Hood?

if you need just any positive lead that is only on when the car is turned over (or at least the key is turned enough to turn the system on). Tap into the aux power output (cig lighter).

But if you need specifically under the hood, cant help you then (although isnt the shift light in the vehicle?)
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Old 02-19-2009, 01:41 AM
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Re: A Switched Positive Wire Under the Hood?

You're gonna have wires running through the firewall regardless, so you can tap into the Cig Lighter output, or if that doesn't work for you, you could tap into the wire for your stereo power.
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Old 02-19-2009, 02:22 AM
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Re: A Switched Positive Wire Under the Hood?

So you need a tach signal(appearantly) and it isn't 12V when car is on. Its AC (alternating current) and should be to the rear of the distributor. (I think) It is a short, 2" blue wire with a gray plug on the end.

If you need the switched power then you don't want to use the tach test wire. Use the ciglighter as recommended.
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Old 02-19-2009, 10:44 AM
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Re: A Switched Positive Wire Under the Hood?

All 3 wires are loomed together in 1 common sheath. Running the tac light "harness" to the vacinity of the coil seemed logical. I too assumed that there might be a switched (+) in the under hood fuse box, but no luck. Now that Fez has fixed me up with the diagram of the Blue tac test wire, I may just back feed the (+) to the cigarette lighter as suggested.

Thanks for your patience and advice. I was only looking for the easiest way to get hooked up from under the hood.

Thanks, V1
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Old 02-20-2009, 06:56 PM
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Icon14 Re: A Switched Positive Wire Under the Hood?

Fez,
Thanks for the picture work. The "Blue" tac test wire is capped and mounted to the right front of the strut tower. Tapped it, ran the new tac feed back into the car and hooked it to the green wire, hooked the Red to an available "Ign on" (+) tap in the fuse panel and Black to a good existing body ground, actually one of the left foot plastic foot rest mount studs. Worked out great. Thanks to all you guys who jumped in and helped me out with this one. Made it easy... Tomorrow we tackle the new head unit install and Boston Acoustic 6x9's without the amp. Can't wait to get started. Fixed the hyper flashing of the turns today with some 50 ohm resistors.....SWEET...now they're normal again...
V1
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