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Old 12-12-2004, 10:39 PM   #1
chen
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Member#: 68385
Join Date: Aug 2004
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Default newb gauge light wiring question

i have no knowledge of electrical stuff so please bear with me. i've searched but couldn't find a specific enough answer

so i have a boost gauge mounted on my steering column (not the oem boost gauge).
the light bulb has a black and a red wire.
1. is the best place to connect these wires behind the radio (where the oem boost gauge would connect).
2. if so, should i just splice the wires since my boost gauge does not have a plug like that?
3. which wire would connect to which?
4. and if i get everything connected correctly at this location the gauge should only light up when i turn my headlights on correct?

also some have suggested wiring it to the wires that lead to the hazard button. is this a better choice? if so, could someone give me a step by step please?
thanks guys
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Old 12-12-2004, 11:14 PM   #2
fpooon
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I, too, would love some help installing a boost gauge.

I have a 52mm Omori full-color boost gauge and the autometer cluster bezel that fits right in front of the main instrument cluster. I guess I'm just in need of wiring diagrams or something to tell me which wires are what. There are 3 big, green blocks that go into the main instrument cluster and then there are a few groups of wires that run over to behind the radio. Either of these is fairly easy to reach, but I don't know what wires are what.

Also, I know it's possible to tap regular-sized fuses... does anyone make taps for these minifuses? If so, I'd like to get some because that would solve my power-seeking wiretap-fest pretty quickly.

It seems like everyone is having to come up with their own solutions for how to get Omori gauges to dim with the dim switch.... I can't wait to get that far.
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Old 12-13-2004, 11:54 AM   #3
satrya
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2002 GDAA
797

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Quote:
Originally Posted by chen
the light bulb has a black and a red wire.
I assume these are the only two wires that come out of your gauges. Then, it's safe to assume that the boost gauge you're talking about is mechanical, and that you don't have to worry about ground sharing between lighting and signal (for the needle). In this case, it doesn't matter what the two colors of the wires that run to the bulbs are. All that matters is that proper voltage be supplied to the bulbs.
Quote:
1. is the best place to connect these wires behind the radio (where the oem boost gauge would connect).
That would be once place. Another place would be to tap the harness that goes into the oem radio/6CD changer unit. www.northursalia.com has useful wiring info : http://www.northursalia.com/m.../radiowrx.html
Quote:
2. if so, should i just splice the wires since my boost gauge does not have a plug like that?
Yes. You can get taps (say, at RadioShack), which should be adequate for this use.
Quote:
3. which wire would connect to which?
If you want the gauge lighting to light up when the headlights are turned on, and dim / brighten along with the oem instrument lighting, then you'd want to connect the red to "Radio Illumination Light +", and the black to "Radio Illumination Light (-)". --> Although I said that the color doesn't matter, it doesn't hurt to follow conventions when choosing which color wire to connect to which polarity. This is in case you eventually replace the bulb with LED, which cares about polarity.
Quote:
4. and if i get everything connected correctly at this location the gauge should only light up when i turn my headlights on correct?
Yes, and dim/brighten along with the oem instruments.
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Old 12-13-2004, 12:09 PM   #4
satrya
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797

Default Tapping the harness to the radio

Here's an example of taps used to get the + & - radio illumination light. One portion of the tap goes through the original wire, and another portion accepts a new wire that will "tap" whatever signal from the original wire. It is not recommended to use this kind of tap in areas that get exposed to the weather. Also, you don't want to use these for power lines (something with high current flowing), as the current rating is probably quite low. For gauge lighting, it should be acceptable imho.

In consideration of future gauge/accessory additions, you may want to add some kind of terminal such that any future additions requiring the same wire will not require tapping everytime. Here's one example, which is admitedly rather sloppy from an electrical wiring point of view. For every wire tapped, you can put a ring terminal on the end. Then, every accessory needing that wire would simply get bolted on using a wire with a ring terminal on one end. This way, you could stack several wires from several accessories on the ring terminal end. Fwiw, I should reiterate that this is a sloppy approach, but should be easy enough to do while being flexible when it comes to connecting additional accessories. Make sure the ring terminal and all metal parts are well insulated afterwards.
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Old 12-13-2004, 02:20 PM   #5
chen
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yes i should have specified that this is a mech gauge.
anyways ill go out and get some taps today, the rest seems simple enough.
you've been a great help, thanks
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Old 12-13-2004, 05:33 PM   #6
satrya
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797

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You're welcome.

One other thing. Generally it is recommended to disconnect the battery during any wiring process. If, in any event, you decide not to do so for one reason or another (say, not wanting to lose the preset radio stations), be extra careful with where the exposed leads and wires scatter around. Avoid making contact with any metal, or one wire to another.
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Old 05-14-2007, 06:44 PM   #7
brodiemash
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3 years later......THREAD JACK! Alright, I have an 06 and I need to wire up my Blitz BLM. Is the radio still my best option for wiring? And if so, does anyone have a pic if what wires I should tap into? I searched and the images I found between here and Scooby Mods all suck when illustrating where to tap into. Thanks!
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Old 09-15-2007, 03:34 PM   #8
2002t-wrex
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2004 WRX Wagon
PSM

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Just ordered a Omori Mech 45mm Boost gauge. So just to confirm, it is best to wire to the Radio Illumination Light + (Violet) and Radio Illumination Light (-) (Orange/White)? And taps should be used to do so?

Thanks guys, gauge wiring newb.
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