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Old 06-27-2013, 01:29 AM   #1
13aphomet
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Default 2010 Impreza new HU chassis ground question..

Hey guys..
Just completed my first stereo install. Ordered from Crutchfield, got the harness, install kit and some wire connectors and decided to go for it..

When I was taking out my factory HU, I noticed a black plug going to a screw on the back of the receiver. After searching I found it was called "chassis ground", but a few places also said that it was just for Aux inputs.

What I did was just ignore that plug and connected black to black (new HU to wire harness). Is this right? Everything seems to be working just fine, but wanted to make sure everything was kosher.

I couldn't seem to get a pic, but I'm sure some of you know exactly what I'm talking about.

Thanks!
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Old 06-29-2013, 01:45 PM   #2
13aphomet
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bump.. anyone?
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Old 06-29-2013, 06:20 PM   #3
wrxeter
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If its the one I think you are talking about (attached to a spade connector on the factory head unit's chassis)... Then yes it's fine.

A ground is what connects to the negative battery terminal via the car's metal chassis. If your new head unit was not grounded, it would not even turn on, so you should be fine.

Just make sure all those connections are solid. A loose wire best case blows a fuse. Worst case, blows a channel on your head unit or the unit itself. Your connectors should be butt connectors wrapped with electrical tape at a minimum. The best connection is soldered with heatshrink tubing.

Do not use t taps or wire nuts. Ever. Those are designed for houses where wires are not exposed to vibrations. Ttaps will wind up cutting the wire eventually. Wire nuts will back out and leave exposed wires and ultimately short out (fire hazard).
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Old 06-30-2013, 01:09 AM   #4
13aphomet
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I got everything installed and like I said it works okay. I used "Posi-connectors".. Crutchfield sold em so I figured they were okay..

Thanks for the response!!
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Old 07-03-2013, 08:49 PM   #5
djinn
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If you want to close off exposed wires i suggest using crimp caps. Definitely don't leave exposed wires that have current (12v) running through them. I personally prefer electrical taping my wires together in order to have a cleaner install.
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Old 07-04-2013, 01:24 PM   #6
klarowe
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Quote:
Originally Posted by wrxeter View Post
If your new head unit was not grounded, it would not even turn on, so you should be fine.
Not true (in most cases). The surround on the antenna is also a ground and will ground the radio enough to allow it to work but is not an adequate ground for long term use.

OP: As long as the harness has a black ground wire, and there is a corresponding pin in the factory wires then you don't need the additional ground. Would it hurt? Not at all, but as long as there is an actual ground in the harness, you do not need the additional ground on the radio chassis.
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Old 07-04-2013, 01:26 PM   #7
klarowe
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No connectors are really a "great" solution. You need a special type of crimper (compound crimpers) in order to properly crimp a connection.... which I'm thinking you probably don't have because they tend to be extremely expensive and most DIYers don't spend the money on them. Your best bet is to solder, tape, and shrink wrap the connections.
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