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What could cause your cell phone charger to blow two 20 amp fuses in a 2005 Ram 1500 when the charger's 2 amp fuse is fine?
Clearly the high current problem is not going "through" the 2 amp fuse, so, it's not going through the charger itself. One possibilty is the lighter socket itself and the way the charger fits it. That particular charger may fit in the socket so that it causes a short when you plug it in. Physically it's connecting the outside and the center of the socket (+12V) together. A 12 Volt socket is no marvel of engineering, it's barely adequate for connecting anything to but it became a standard anyway. The fit of each socket varies from one vehicle to the next, it's not supposed to be able to short under use but I've seen it happen. If that's the case you need to adjust the way it fits, replace the socket, etc. Another possibility is the way the center wire moves "behind" the socket when you plug something into it. The center wire gets pushed back in a little and may come in contact with a ground and pop! There goes the fuse. You can determine what is going on by looking at the socket and the end of your charger where it plugs in. Blowing 20 amps fuses takes quite a bit of current so most likely this would leave a mark on whatever metal was in there causing the short. Check for a very small burn mark on the tip of the charger. If there's a mark then you know which part was touching where it shouldn't be. Also check that no foreign object fell into the socket like a tiny piece of metal. If you want to check out the charger itself try it on another vehicle or get some wire, put a 2 amp fuse in-line with it and connect the charger to any 12V DC source. Make sure you get the polairty correct, usually the center post is positive, and the outside is negative. When you connect it nothing should happen other than the charger turns on. If it blows the new in-line 2amp fuse then there is a problem with the charger itself but that's not likely. I think the charger is shorting the vehicle socket when you plug it in. Dave
What else can I help you with?
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