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  #1  
Old 07-04-2007, 08:40 AM
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Default White Positive & Grey Ground?

Been reading some of the helpful posts about installing a power outlet. I'm going to mount a weather-proof 12v cig-lighter socket in the tray, and connect it to the battery leads, with an inline fuse. It will be used to power a small compressor for inflating tires.

My question is about the socket I bought...

It has a white and grey wire, instead of the usual red and black. Can I assume that standard would be white = center pole positive, and black = ground/negative?

Thanks in adavnce.
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Old 07-04-2007, 09:03 AM
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That's probably it but it's a better idea to check. If you don't have a voltmeter, get a 9v battery. Touch one pole to the outer metal case which is ground. The ground wire will make little spark when touched to the other pole as it completes the circuit.
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Old 07-04-2007, 09:37 AM
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Quote:
Originally Posted by greywolf View Post
That's probably it but it's a better idea to check. If you don't have a voltmeter, get a 9v battery. Touch one pole to the outer metal case. If the grey wire really is the hot, it will make little spark when touched to the other pole.
I think you meant "If the grey wire really is the negative," ? (The outer metal case of the cig lighter is the ground)
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Old 07-04-2007, 09:43 AM
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Thanks...


My next step was to use a piece of wire and a flashlight to see if the grey lead gave me conductivity to the shell of the connector.


One other question I just thought about...

What amperage fuse do you guys recommend inline with the power outlet?
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Old 07-04-2007, 09:54 AM
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Quote:
Originally Posted by msi1259 View Post
I think you meant "If the grey wire really is the negative," ? (The outer metal case of the cig lighter is the ground)
Yes. I was thinking of testing for power in an installation rather than continuity. I'll change it. Thanks.
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Last edited by greywolf; 07-04-2007 at 09:56 AM.
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Old 07-04-2007, 01:42 PM
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What about the fuse amperage, what do you gurus recommend for this application?
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Old 07-04-2007, 06:22 PM
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Glad I took the advice to check the polarity...

The white wire turned out to be the NEG, and the grey wire was POS.


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Old 07-04-2007, 08:16 PM
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Quote:
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What about the fuse amperage, what do you gurus recommend for this application?
I'm no guru, but it should be fused for the wiring leading to the cig lighter (and the rating of the lighter) - the larger the wire, the larger the fuse can be. (you want the fuse to blow before the wire melts). I wouldn't fuse it much over 15 amps (assuming 14 awg wire), likely 10 amps would be best....
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Old 07-04-2007, 09:29 PM
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Thanks...

A 10 amp fuse was what I ended up using.
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Old 07-05-2007, 07:08 AM
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Night_Wolf...

There was no information on the back of the package, obviously.
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Last edited by Newfoundlander; 07-05-2007 at 11:15 AM.
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