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Old 01-16-2003, 10:12 PM   #1
ants wrx
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93 RB25det powered 240sx

Default teach me how to install a head unit......please! lol

ok i should have a brand new Alpine cda-7894 shortly. i'm not going to know how to install it and i really don't want to pay someone to do it for me...plus i would like to learn.

should i buy the harness that crutchfield.com sells for the WRX? the harness looks like it has a plug on one end and a bunch of wires coming out...where do those wires go? lol i'm a total newbie to this so bare with me..

i couldnt find any decent tutorials on the net..they are all very general and i don't understand. so if it's possible can you explain in detail? also, i need to do this so that it will be easy to remove and replace the stock HU

thanks in advance to anyone who responds,
Anthony
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Old 01-16-2003, 10:53 PM   #2
Kwyjibo
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your gonna need the harness...

where you get it from is up to you.

If you get it from crutchfield, call to order it and ask the guy to also give you the head unit install directions....they have em for a lot of cars...

its not that hard...good luck
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Old 01-17-2003, 12:10 AM   #3
kenchan
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i gotta question too...

on the factory hu, when you pull it out, there is a black clip with wire that hooks up to the right side (facing the hu) of the metal case.

what is that clip and wire for? RF related?
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Old 01-17-2003, 01:15 AM   #4
armand1
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kenchan - it's a grounding wire.

ants wrx - order the harness from Crutchfield. They should have a free pamplet on how to install head units, speakers, etc that they will include. You may be able to get WRX-specific instructions from them, too.

The general idea is that head units come with one or more wiring harnesses that consist of plastic plugs that plug into the back of the head unit. The other end is just loose wires. These wire ends need to be hooked up to the loose wire ends on the car-specific harness that you get from e.g. Crutchfield. Then, the plastic connector on the car-specific harness plugs into the plastic connector in the car.
First, of course, you physically mount the head unit in the metal brackets that come with the car radio. After the plugs are plugged in, screw in the radio/bracket unit into the car, replace the fascia panel, and you're good to go.
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Old 01-17-2003, 06:54 AM   #5
Mulder
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I have a 7894 and it's not hard to install, but you will have to run a power wire directly to the battery so it's not just a straight plug-in.
If you buy the unit from Crutchfield they will supply everything you need for the install including the harness adapter, DIN pocket and instructions for removing the old unit and installing the new one. You will have to supply the wiring to the battery but it's all stuff you can get at Radio Shack.
Crutchfield is more expensive than other retailers but they provide more "extras" as well as free phone support to help you complete the install.
You should also post in Tri-State, there are a bunch of people in NJ who would be willing to help you.
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Old 01-17-2003, 01:04 PM   #6
kenchan
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armand1- cool. thanx. but what about the gray wire that has
a terminal ring and crews onto the same side of the chassis? is that another ground? if so for what?

thanx.
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Old 01-17-2003, 03:09 PM   #7
ants wrx
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the power wire that goes from the cda-7894...what guage wire do you have to use? also, will my stock speakers sound better with this head unit until i get new speakers too? (either infinitys or mb quart)

thanks
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Old 01-17-2003, 03:11 PM   #8
ilara72
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Quote:
Originally posted by mulder
I have a 7894 and it's not hard to install, but you will have to run a power wire directly to the battery so it's not just a straight plug-in.
If you buy the unit from Crutchfield they will supply everything you need for the install including the harness adapter, DIN pocket and instructions for removing the old unit and installing the new one. You will have to supply the wiring to the battery but it's all stuff you can get at Radio Shack.
Crutchfield is more expensive than other retailers but they provide more "extras" as well as free phone support to help you complete the install.
You should also post in Tri-State, there are a bunch of people in NJ who would be willing to help you.
Hey guys. I have a 7894 also. Crutchfield is comparable to good guy, circuit city etc prices, but they give you the extras as mentioned above. If its your first time doing it yourself, then I say go with crutchfield and you have the phone support for life etc.

As far as running a power cable to the head unit, I feel it is not necessary. The peak output of the head unit is only like 5 watts per channel more than the other conventional head units from alpine. Our cars and japanese cars in general have relatively thick guage wires so IR drops in the power cable isn't much of an issue. My old saturn had very thin wires so running a power cable from my battary would have prob been necessary in that case.

I got a couple of alpine amps to match and it sounds great. Good luck!
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Old 01-17-2003, 03:15 PM   #9
ilara72
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Quote:
Originally posted by ants wrx
the power wire that goes from the cda-7894...what guage wire do you have to use? also, will my stock speakers sound better with this head unit until i get new speakers too? (either infinitys or mb quart)

thanks
You should cleaner sound from the alpine head unit as opposed to stock. The stock speakers will limit the marginal performance increase from the alpine.

Just do some searches, new front door speakers aren't a simple drop in. You need spacers/adapters. The rear door 4" are a simple drop in.
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Old 01-18-2003, 02:21 AM   #10
ants wrx
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93 RB25det powered 240sx

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for you guys that said you have a cda-7894...where does the power wire from the battery get attached to? the thin yellow wire on the radio harness that has a fuse attached to it?

that yellow wire is attached to the yellow wire of the PlugnPlay harness i bought and everything is working fine...i dont see why i need to have a separate wire going to the battery.

the guy at the store told me i needed to and he told me to buy this amp wiring kit that comes with 8guage wire and a fuse box hooked up to it. is this really necessary? if so, please tell me how to hook up this 8guage wire to the thin yellow wire on the radios harness
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Old 01-18-2003, 06:59 AM   #11
Mulder
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The Alpine may have marginally more power than other AFTERMARKET head units but they all have a lot more than the stock one. I have to disagree about the wiring- it's not that heavy and it is a good idea with any new HU or amp to wire the power directly to the battery. Aside from reducing voltage drop this will also minimize noise from the electrical system.
Yes you can connect it to the existing harness and it will work but the performance may not be optimum. Leave it alone for now but if you're afraid to mess with it any further get some help from someone more experienced to connect it to the battery.
You don't have to buy one of the expensive "kits" they sell, all you need is some wire (doesn't have to be 8 gauge, 10 or 12 will do for this), the proper terminals, and an inline fuse as close to the battery as possible. It would be connected to the yellow wire in the Alpine harness as per the instructions that come with the unit.
As for speakers, if you have the factory "upgraded" speaker option you will already have spacers in the front doors that will accept many 6-1/2 " speakers. If you only have the stock speakers there will be no spacers and you have to add some before other speakers can fit.
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Old 01-18-2003, 03:06 PM   #12
momoney627
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Whats up Ants most of those people at those stores don't know what the hell they are talking about. Install like that should take about 30min. Where in N. NJ are you I'm in Princeton if you want to come down I'lll show ya how to do it right..609-209-4661. I actually did my friends alpine 3 days ago in his WRX looks nice.

Momoney627@aol.com
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Old 01-19-2003, 12:13 AM   #13
ants wrx
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Default

momoney, hey i live in kearny..its by newark. thanks for the offer man, i appreciate it a lot. i will email or pm you if i have any problems. i already got the head unit installed. it looks real good and sounds nice too. i cant wait to hook up an amp and better speakers

thanks again,
Anthony
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