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.
A fuse that keeps blowing is probably the result of a wire that is grounded unintentionally. This would be the result of an exposed power wire touching the engine or body and grounding out. This would cause an excessive power draw and blow the fuse. The other option is that the fuse was lower amps than the original one. check the fuse diagram to see if the amps match up.
WHEN A FUSE BLOWS YOU HAVE A SHORT OR SOMETHING SHORTING OUT IN THAT CIRCUIT.MANY THNGS CONTROLLED BY 30 AMP FUSE PCM POWER RELAY, POWER WINDOWS.LOOK ON FUSE DIAGRAM COVER FOR 30 AMP FUSE THAT BLOWING SEE WHAT CIRCUIT THAT FUSE CONTROL OR LOOK IN DASH OWNERS MANUAL SEE WHAT THE 30 AMP FUSE CONTROL SEE WHAT CAUSING IT TO BLOW.
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
Fuses blow when there is an overload. This is caused by a faulty part in either the power supply (such as transformer or any semi-conductor -diodes, rectifier, IC, transistors etc) or in the main amp stage - anything on the heat sink. The most common cause is a semi-conductor acting like it was just a piece of wire. A cause of an overload alsot is a speaker wire shorting, which blows out the transistors on the heat sink or whatever is on there, they in turn blow the fuse!
Whatever value fuses is put in will blow! The higher the rating however could cause something to get hot thus causing a fire, before they do go!
If the 500ma fuses where the originals marked on the end cap, then stick with them. Often it is writtten on the PC board too.
What circuit? Check the owners manual and see what all is powered by the circuit that blows. For example - the dome light and cigarette lighter could be powered by the same fuse. A dirty element on the lighter could cause cause shorting that would blow the fuse and put the dome light out. The symptom that you notice might not be the cause. You could also have a wire that has damaged insulation that is shorting to ground and blowing fuses. Faulty or worn parts could cause blown fuses.