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Old 09-22-2010, 09:11 PM
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cigar lighter wiring

If you install a cigar lighter in a car that has none,should it be ran through a relay?

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Old 09-22-2010, 10:09 PM
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Do you want to be able to use power from it when the ignition is off?
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Old 09-22-2010, 11:50 PM
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no need to run thru a relay.. easiest way I usually do them, is just run them right to the battery with 12ga wire. put an inline fuse right next to the battery and it works just fine... if you wanted a more professional approach, just go to a unused circuit in the fusebox.
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Old 09-23-2010, 02:54 AM
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If you look on your fuse block, there are a couple of unused male connectors.
You can used a continuity tester to find which one is full time hot or switched on hot with the key.
Run your wire to the fuse block and put a female crimp style connector on it and plug it in to whichever one you want. if you mount the lighter in a plastic dash, you'll need to ground the lighter socket to metal or it won't work.

Or, keep a bic lighter in the console like I do!
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Old 09-23-2010, 05:10 AM
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Most cigarette lighter sockets are rated for 10 amps, but a few will take up to 20 amps. You could use one of the unused accessory tabs in the fuse box, but I prefer to connect a separate wire and bypass the fuse box. Put the inline fuse as close as you can to the power junction point.

My truck (75 GMC) has a wire junction that is mounted on the firewall next to the brake booster, and I used that as a point for adding accessory circuits that have a fairly high amp draw. The accessory socket I used has a separate ground wire, so I did not have to worry about using the mounting point itself as a ground.

Whether you want to use a relay will depend on what you want to use the cigarette lighter socket to provide power for (e.g. cell phone, GPS) . With a relay you have the option of turning the power to the socket on and off through the ignition, or using a manual switch. If you wire directly to battery power it will always stay on.

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Old 09-23-2010, 05:15 AM
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OR- you could use one of the extra circuits in the fuse box! lol

Seriously though, most vehicles have a circuit that would have included the lighter, unless this is a newer vehicle that come w.o a lighter, period. If it's an older vehicle, look at the fuse box labels or schematic to find the correct circuit and amperage rating.
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