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Old 10-12-2005, 01:00 PM   #1
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Member#: 22952
Join Date: Aug 2002
Chapter/Region: MWSOC
Location: Macomb, MI
2014 STi Hatch

OMGHi2U Question about wiring

With my past car i alwys used "vampire" tap connectors to source things for power and what not. Well, with my current car, as i have had to wired some things up i am soldering everything, but i am not sure what is the CORRECT way to take 3 wires that i have to a positive source (only while the key is on). Some people, told me to just wire it into the fuse box...which didn't sound right, but that is all they said.

So could anyone help me out here as i am trying to finish up a wiring project tonight (as far as making the connection, what type of connectors). and yes, i drive a evo, but i still am on here more than any other forum lol. Thanks alot
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Old 10-12-2005, 10:42 PM   #2
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Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Belleville, MI
3.3 I <3/h8 my GF3


So, you want all three wires to be on when the car is on.

The CORRECT way would be to get a relay, tap the battery, tap a wire like the radio that's on when the car is on, use the radio wire to trip the relay and turn on your other three wires.

The Easy way, without looking foolish, is to tap one wire from the fuse box to some sort of distrobution area (however you want to do this, bolt, solder the 3 wires together, etc). Then run the 3 wires where you want them, so that your only tapping one wire from the fuse box. However, this wont work if your planning on running something power hungry from those three wires. amp turn on wires are fine, auxillury lights are not fine.

The bad way is to tap 3 wires, one for each of your new wires.

and dont use vamp taps, they are crap, and will fail over time. Good to see you soldering everything.
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Old 10-13-2005, 08:40 AM   #3
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Location: 'tween Lewisville&Clemmons NC
1998 TransAm cnvrtbl


This 3M t-tap style wire tap is actually very reliable.

One pierce and a shielded male spade connector holds it closed.

There are 3 sizes and if you use the right one, you can easily have well over a decade of worry free conductivity. I'd say the failure rate is better than one out of a thousand, and even better if the install is proper/ careful.

On the other hand, this parallel style scotch-loc, (also a 3M product) has a failure rate closer to "every-other."

It's a sure fire way to get something to fail. I feel confident enough in its total 'suckage' that I'd wire it from a constant 12v directly to my dome light, and by morning, the dome light would be off, and my battery would be fine. (Open the door, and the little vibration would close the crappy connection and the domelight would come on again.)

The scotch-loc is so bad it should become illegal.

Granted, the t-tap is not as good as soldering, but I'd use it for 99.9% of the connections in a car before I'd take a hot soldering iron under the dash with me. If you can make the connection outside of the vehicle, then owning a decent soldering iron and heat shrink is worth piece of mind.

Wrapping soldered connections with anything but the finest electrical tape is screaming for short circuits though. Hot interiors melt crappy electrical tape adhesive.

As for tapping fuses in the fuse box, see the scotch-loc description above... and add the phrase "permanent damage" to the list.
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Old 10-13-2005, 09:38 AM   #4
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Location: In your pant[ie]s.
2017 Silver Forester
with not enough lights...


Well, first of all, what are the three wires going to be doing? For my auxiliary lamps, i have 3 relays all tapped to my radio fuse using one of these: http://www.gpsfleetsolutions.com/ima...r/fuse_tap.gif. However, stay far far away from the traditional fuse tap seen here: http://www.autotoys.com/pics/fusetaplarge1.jpg

The radio fuse is more than adequate for powering relays. For larger items, you'll have to use a relay (on the radio fuse) and then connect the device directly to the battery.
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Old 10-13-2005, 07:20 PM   #5
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2014 STi Hatch


Thanks for the info so far guys.

The wires are for:
-power to my methanol pump
-power to my aem w/b
-power to led for my meth pump to let me know when its activated
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Old 10-14-2005, 12:32 AM   #6
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'06 WX8


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Old 10-14-2005, 12:41 AM   #7
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Lava Grey


^^^^THose look cool - will DEF pick up a few of those for my next project.
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Old 11-10-2005, 07:57 PM   #8
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2010 Suzuki Kizashi


Wait a second - what is so wrong with tapping the fuses with one of those gold connectors - they seemed pretty hassle free to me - I was thinking about wiring the power of my boost and egt gauge with those things. Could I/should I use the little plug on the radio harness that has nothign attached to it instead???
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