Blue wire

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Db09
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Joined: Mon May 05, 2014 6:35 pm
MGF Register Region: Cotswolds
Model of Car: Volcano orange f

Blue wire

Post by Db09 » Tue Apr 07, 2015 7:10 pm

image.jpg

Hi guys spent all of Easter doing a list of jobs on George .
Rub down clear rust and respray black surround round front windscreen . Done
Take out old walnut dash stuff put new in . Done
Clean and reproof soft top .done
Put stereo in as previous owner took his after market one out .
Got original mg radio/cd player should be an easy job ? Not so .
When I went to have a look at the wires in space where stereo sits found above loose blue wire no idea what or where it comes from ?
Any of you guys have any idea please .

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talkingcars
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Re: Blue wire

Post by talkingcars » Tue Apr 07, 2015 10:50 pm

I bet that is a trigger wire for a sub.
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Chris Tideswell
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Re: Blue wire

Post by Chris Tideswell » Wed Apr 08, 2015 12:38 am

I agree, blue wire is often a trigger for something else that need to be switched on when the head unit is powered up.

AlexBarwell
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Re: Blue wire

Post by AlexBarwell » Fri Oct 13, 2017 6:20 am

Sounds like bomb defusing eh!
Depending on what you've got and the stereo unit concerned, one colour blue can be to sub activation, but also another for a powered aerial. This goes from low volts when unit it off to high volts, as a trigger to the device, but NOT a power feed, I was sorting my Uncle's MG C and an innocent miswire of the control box for the powered aerial (yurgh!) led to that trigger wire being overloaded so it won't deliver a strong enough trigger anymore and is fairly directly off an embedded chip of the unit.
On a standard aerial you shouldn't need to do anything, just keep it insulated. The aerial plug, and typically the two odd-shaped ISO (?) plugs - one for power and the other for speaker connections.

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