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<blockquote data-quote="DidUHearThat?" data-source="post: 4689459" data-attributes="member: 594758">That would be best.&nbsp; Despite your heavy wire and dual batteries, you still only have a 70 amp electrical system.&nbsp; Higher amps will only be seen when there is a short circuit, like a cable gets cut and grounds to the chassis.&nbsp; Then you could run over 200 amps, for a few seconds, then things start to burn and explode.&nbsp; The smallest fuse possible will give you the most protection.I suggest you look around at what a HO alternator would cost and how big they are for your size truck.&nbsp; If you can upgrade to a 120 amp for a reasonable amount of money, then I would buy fuses with that future upgrade in mind.&nbsp; So you could put in 120- 150 amp fuses, planing on the future alternator upgrade.Your going to have serious problems trying to drive a 1200 watt amp from a 70 amp alternator.&nbsp; 1200 watts = 100 amps @ 12 volts.&nbsp; Your already 30 amps shy, not including what your car needs to run.</blockquote>

[QUOTE="DidUHearThat?, post: 4689459, member: 594758"] That would be best. Despite your heavy wire and dual batteries, you still only have a 70 amp electrical system. Higher amps will only be seen when there is a short circuit, like a cable gets cut and grounds to the chassis. Then you could run over 200 amps, for a few seconds, then things start to burn and explode. The smallest fuse possible will give you the most protection. I suggest you look around at what a HO alternator would cost and how big they are for your size truck. If you can upgrade to a 120 amp for a reasonable amount of money, then I would buy fuses with that future upgrade in mind. So you could put in 120- 150 amp fuses, planing on the future alternator upgrade. Your going to have serious problems trying to drive a 1200 watt amp from a 70 amp alternator. 1200 watts = 100 amps @ 12 volts. Your already 30 amps shy, not including what your car needs to run. [/QUOTE]

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