Check your ground and make sure it is properly grounded ....it needs to be a very clean paint/gum free area tightly bolted. Next Check and make sure you are recieving your 12 volts (not running) 13 (running) by placing your test leads from positive to ground...... then make sure your power remote from your head unit is putting out voltage.
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This speaker at full power draws average 1.3A at 230V and 2.5A at 120V. Mackie's recommended fuses are in line with this so your fuse is actually too high a rating. It is possible you are using cheap fast blow fuses or are over-driving the speaker (which should cause the fuse to blow) These speakers are only capable of 118db sustained (@1M) so cannot be expected to cope with anything but small venues or gentle music.
the problem could be the fuel pump fuses only blow when they are overloaded ie. if you have a 15 amp fuse & the fuel pump or whatever is drawing 20 amps the fuse will blow,if you are using the right amp fuse the fuel pump is drawing too much power & may be faulty or there is a problem with the wiring, a loose connection or the like.....hope this helps....cheers
Dissconnect ALL speakers from back of unit then try to turn on.
If it works you have a speaker short.
If not, you have a more serious problem.
DO NOT replace the fuse with anything else but what was specified, as it can cause a fire!
To have 3 speakers bridged, each speaker must have at least a 12 ohm impedance (assuming that all speakers are connected in parallel). If you're running a load lower than 4 ohms (mono), the amp will likely fail.
The fuses don't blow right away because they are cold at first. As they heat up, they can blow more easily (even though the current draw hasn't increased).
Make sure the fuse you put in matches the power requirement of the device you're installing the fuse into, putting a fuse that does not handle the current will cause this, but do not overshoot as this may fry your device - it must match.
If you know it's matched, then the device you're installing the fuse into may be faulty in such a way that it is drawing the wrong amount of power. This can be due to the power supply on the unit.