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Old 12-13-2012, 10:08 PM
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The flasher manufacturer just want you to provide fuse protection for your flasher in the case that a wire gets grounded out or the load is higher than the flasher is rated for.

Grote 44890

Grote states a min of 1 Amp fuse, a max of 20 Amp ... as stated on the flasher.

Passenger Cars/Light Trucks LED Compatible EL12, 20mA~25A; Electro-Mechanical Flasher; 1 to 12 Lamps; 400 Hours; 12 Volts, 300 Watt
This flasher is rated for 300 Watts.

Using the formula:
Amps = Watts/Volts
Amps = 300/12
Amps = 25

So, if this flasher is capable of flashing 12 bulbs, (25/12) the 2 amps per incandesant bulb makes sense.

LED's will draw significantly less, so IMO I'd start with a 5A fuse and go up from there if it blows.
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