My sister plugged a defective cell phone charger into the cigarette lighter of my 92 Mazda Miata. After that, the radio and the cigarette lighter(that I would like to plug my own working charger into) would not work.I checked the fuse "box", but could not identify which fuse protects the radio and cigarette lighter part of the circuitry. I don't have an owner's manual and the two parts stores that I went to in town could not help me locate the correct fuse.How is the fuse that I am looking for labeled? ..or how do I identify the culprit fuse? Thanks, DAVE
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There is an alternate problem with the wiring in the cigarette lighter where the wire melts and breaks. If you pull out the cigarette lighter assembly you will see a place where one wire splits into two. Find the damage point and replace the wire with a thicker one.
Check for a blown fuse in the power circuit to the radio.
If your radio is an aftermarket one, it may have been improperly installed and powered from the cigarette lighter circuit. If so, check the fuse for the cigarette lighter circuit.
It may be that a "fusible link" was blown open when you attached a defective cell phone charger (what you call a "memory charger?) If so, you will have to get professional help in finding the location of the fusible link, often buried within the car's wiring harness.
I wish I had a dollar for every time I have heard "All fuses are OK" or "I already checked the fuse" or "I know it's not the fuse"....I'd be a rich man!
When cigarette lighters quit working, 99% of the time the fuse is blown because someting got plugged into it like a defective phone charger. The other 1% of the time, it is because the lighter element is burned out or somebody essed with the wires to the cigarette lighter trying to install some kind of aftermarket equipment.
Humor me and check Fuse #9 (20 Amp) in the passenger side fuse and relay box.
The lighter itself could have gone bad. The actual cigarette lighter part go bad if they are used frequently. The socket part are less likely to bad but they do on occasion. If you have a car charger for your cell phone or something of that nature you can find out if its the receptical or the lighter itself.
The cigarette lighter plug should also work for the phone charger as long as the phone charger uses the cigarette lighter style plug(long with two metal contacts on the sides and a button contact on the tip). Most standard car chargers will fit both cigarette and auxillary style plugs.
The memory wire of the radio,(the power for the clock and channel settings) is usually connected to the same circuit as the cigarette lighter. (there is a seperate fuse for radio) Check your cigarette lighter socket for damage or dirt, etc. could be causing the memory fuse to blow. Also check your cig lighter accesories (like cell phone chargers,etc.)
P.S. The backlight is also a seperate circuit (connected to interior light/parking light circuit)
Cell phone chargers commonly blow the fuses at the power points. It seems that our charger adaptors do not match the socket properly, and the positive part of the charger hits the negative of the socket, resulting in a blown fuse. If you have a charger, and it works, leave it in the socket. Don't take it with you. Repeated insertions of the adaptor to the socket magnifies this issue.