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check the fuse box inside the truck and under the hood 1 should be marked for cigarette lighter or Power Point or accessory if you did not out you need to pull the cigarette lighter from the dash so you can get to the wires in the back of the lighter and then test the wires with a test light to see if it's getting power probably just a piece that's what generally goes wrong
you could do this by running 2 wires directly from the battery to the back of the cig lighter and by fusing the positive.if it is only when using the cig lighter and not when charging a phone ect.it could be element on the cig lighter shorting
There are two ways of going about it. The best way to do it would be to use a relay. Cut the 12v+ wire going to the cigarette lighter, hook one side up to terminal 87 and the other side to 30 of the relay. Ground pin 85 and hook up pin 86 to a switched ignition wire. Doesn't matter too much which ignition switched wire you use. The radio is near by and has a switched ignition wire you can tap off of. The relay draws very little current so it won't affect the other circuit. Doing it this way keeps the power to the cigarette lighter on the original circuit, but switches it on when the ignition is on. You can purchase an automotive relay like the one pictured at radio shack or any auto supply store for a few bucks.
1. Decide if you want the power to the radio to be full time or only when the key is on.
2. If you want part time the easiest power source to access is the cigarette lighter. You can either splice into the power wire going to the cigarette lighter (center lead) or you can get a cigarette lighter plug and install it on the end of your two power wires. Center is the positive. The plug costs about $4 and takes about 10 minutes to install.
3. If you want full time you will need to find a circuit that is hot at all times and splice into it.
Use a noise filter on the power as just about all circuits in the vehicle are liable to be noisy power circuits and this will show up in form of excessive static noise during radio operation.
The red with the fuse is your positive lead. Do not hook these up backwards as this will certainly ruin the radio.
Look in your manual for the Power Distribution Box reference in Roadside Emergencies, page 210. It should be located under the hood on the driver's side. My 2002 Explorer has two power points on the center console and the 20A fuses in the Power Distribution Box for them are number 7 and number 9. They cost $3.99 each at AutoZone. The cigar lighter fuse under the dash is unrelated.
start with a test light and check for power at the center of the cigarette lighter socket. If power is good, then check for ground at side of lighter socket.
If no power, run wire from power wire of lighter to power wire of stereo, thus tapping the power directly and bothering to trace out where the open int he circuit may be.