As soon as I plug it into the 12v outlet in either of my cars the fuse blows. The fuses are 250v 2.5 A (recommended kind) but it isn't working. We bought the unit new and used it for a few hours on vacation (one day) and after that it would blow the fuse every time we plugged it in.
House outlet works fine (of course, no fuse there).
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I'm guessing this is a large Pro Espresso machine. 250V/15A is a bit low as they usually range in 25A which should be on a 250V/30A line. Not your normal home outlet unless your using a washer/dryer outlet. You need an electrician to check if this much power is available on your premises. Check the nameplate rating on the machine to confirm this. If everything checks out and your still blowing fuses then the heating element needs checking. Blown (cracked) elements will short out in a tank of water causing over boiling and high steam pressure. Serviceman should check this as there are dangerous voltages present. Aloha! ukeboy57
Where do you have a 9 volt? I'm assuming you mean the outlet that we used to call the cigaret lighter? If so, it's a 12 volt outlet. Its pretty common for this fuse to blow, I'd definitely check that first. Get a few fuses because it likely blew from a bad accessory you plugged into the outlet. Also, try a few different accessories and verify that it's not an issue with the one you're plugging into it. If you replace the fuse and it blows again then the problem is being caused by whatever you're plugging into it.
The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.
On our 2001 Chevrolet Venture (same vehicle under the sheet metal), both the front and rear 12v outlets are controlled by the same fuse, which is in the fuse box located next to the passenger front door. If one of these outlets blows the fuse (a portable ball/tire inflator will do the trick with us), all of them will shut down.
I have also had the 12v outlets stop working, even when the fuse was good. I discovered that I had a bad connection at the fuse box; wiggling the fuse box assembly itself would cause the outlets to flicker on and off. Detaching and re-attaching the modular cable that connects the fuse block seems to have corrected that problem for the most part. However, sometimes, our 12v outlet will still flicker, even though power remains constant to everything else in the vehicle.