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<blockquote data-quote="Graves" data-source="post: 8720923" data-attributes="member: 681362">OP,&nbsp; it doesn&#039;t matter that the amp only draws 40 amps full tilt for very brief moments.&nbsp; The 200 amp fuse is to protect the wiring.&nbsp; If there is a short, what will give out first the 200 amp fuse or the wiring to your fuse box terminal?&nbsp; Because it looks to me like the wiring to the fuse box terminal is less than 0 gauge.&nbsp; If the wiring to the fuse box stud is fused or capable of handling 200 amps you are fine.&nbsp; If it is not, then it isn&#039;t a matter of opinion,&nbsp; it is done incorrectly.If it is incorrect drop down to a 100 amp fuse or connect it strait to the battery if you care about your car.I was by no means was I disagreeing with ThxOne,&nbsp; by all means why not have an immediate ground to the car and a wire to ground for shits and giggles (although aluminum is a better conductor than steel so Im not sure I understand what point he was making there)?&nbsp; It is great advice to make sure everything is tight and corrosion free, especially when experiencing issues.From what you are describing, lower RPM&#039;s more voltage drop, increased RPM increased voltage, big voltage drops when only running a 400 watt amp tells me you need more amps and that makes me wonder if your alternator is still preforming to specification.I think you are spot on about having the electrical system checked, i&#039;d make sure that includes a &quot;alternator amperage output test&quot;.&nbsp; Easy to do with a clamp on ammeter.Good luck!</blockquote>

[QUOTE="Graves, post: 8720923, member: 681362"] OP, it doesn't matter that the amp only draws 40 amps full tilt for very brief moments. The 200 amp fuse is to protect the wiring. If there is a short, what will give out first the 200 amp fuse or the wiring to your fuse box terminal? Because it looks to me like the wiring to the fuse box terminal is less than 0 gauge. If the wiring to the fuse box stud is fused or capable of handling 200 amps you are fine. If it is not, then it isn't a matter of opinion, it is done incorrectly. If it is incorrect drop down to a 100 amp fuse or connect it strait to the battery if you care about your car. I was by no means was I disagreeing with ThxOne, by all means why not have an immediate ground to the car and a wire to ground for shits and giggles (although aluminum is a better conductor than steel so Im not sure I understand what point he was making there)? It is great advice to make sure everything is tight and corrosion free, especially when experiencing issues. From what you are describing, lower RPM's more voltage drop, increased RPM increased voltage, big voltage drops when only running a 400 watt amp tells me you need more amps and that makes me wonder if your alternator is still preforming to specification. I think you are spot on about having the electrical system checked, i'd make sure that includes a "alternator amperage output test". Easy to do with a clamp on ammeter. Good luck! [/QUOTE]

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