crownvictoria31 Posted August 22, 2018 Report Share Posted August 22, 2018 I have about 2400 watts rms in my crown vic lx sport. 200amp alternator and 2/0 gauge ofc big 4 done under hood. What size fuse between amp and alternator should I be running? I am currently running a 250 amp. All my amps in the trunk are fused before the amps. Link to comment Share on other sites More sharing options...
AlpineNut Posted August 22, 2018 Report Share Posted August 22, 2018 Well without knowing the model of the amp it is hard to tell, that alone will set the parameters for the size of the fuse you will need. 73456w9vbwevsdb sodtbsorutnvsd sdtuspdun sd d f gsdfiusd gdf n Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 22, 2018 Report Share Posted August 22, 2018 It's not your amp and alternator you should be concerned with, it's your battery and anything connected to it ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
crownvictoria31 Posted August 22, 2018 Author Report Share Posted August 22, 2018 opps im sorry. I ment battery and alternator. What fuse size between battery and alternator Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 22, 2018 Report Share Posted August 22, 2018 300, mounted as close to the battery as is practical Use a proper bolt in ANL fuse holder too. The set screw type ones have no place in under the hood applications https://ceautoelectricsupply.com/product/high-amperage-anl-fuse-holder/ ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
crownvictoria31 Posted August 22, 2018 Author Report Share Posted August 22, 2018 Ive been told by a few people that 250 should be more then enough. Explain why the 300 amp fuse for a 200amp alternator. Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 22, 2018 Report Share Posted August 22, 2018 250 works too 300 is standard fuse size for 0 gauge OFC ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Joshdashef Posted August 23, 2018 Report Share Posted August 23, 2018 3 hours ago, crownvictoria31 said: Ive been told by a few people that 250 should be more then enough. Explain why the 300 amp fuse for a 200amp alternator. I believe that some alternators can actually output beyond their rated amperage. Hence the higher fuse rating of 250 but a rating of 200. I think 250 or 300 would work in your case. Regardless the fuse is just there for the worst case scenario, a short circuit, preventing excess amperage running through a wire - and heat / fire. Just make sure you fuse within 6 inches or so of the alternator and before you enter your battery. That way your wire is protected from the alternator hot side, and the battery hot side. If your hooking this straight into your amplifier then fuse according to the manufacturers specs. Here is something I stumbled upon a while ago when searching up what size fuse for my mechman alternator. I know this is a different brand but it is the same idea: Link: MECHMAN: Quote Your fuse should always be greater than your max amperage. Our Mechman alternators are underrated, so if you had one of our 270amp alternators you would need close to a 300 amp fuse. A little cushion goes a long way in preserving your electrical system and stereo components / accessories. I hope this helps. Michael [email protected] SMD Tool Map (2022): https://www.stevemeadedesigns.com/board/topic/220267-smd-tool-map-2022/ My Port Size Calculator (in progress): https://www.stevemeadedesigns.com/board/topic/217087-port-size-calculator-in-progress/ Common Port Walls for a Slot Port: https://www.stevemeadedesigns.com/board/topic/217076-common-port-walls-why-it-matters-to-your-box/?tab=comments#comment-3240313 Link to comment Share on other sites More sharing options...
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