conkay Posted March 12, 2015 Report Posted March 12, 2015 I am currently in the process of upgrading the electrical system on my crx. I installed a 240 amp alternator and I'm trying to figure out how to upgrade my charge wire. The factory wiring consists of a 10ga wire from the alternator to the fuse box protected by a 60 amp fuse. There is no way to get larger wire into the fuse box. And my other concern is the alternator putting out more amperage than the fuse box can handle. Any help would be appreciated.
audiofanaticz Posted March 12, 2015 Report Posted March 12, 2015 The alternator only puts out the current that is called for when a load is present it puts out more amperage. You upgrade the wire from your alternator charging stud to your battery.
conkay Posted March 12, 2015 Author Report Posted March 12, 2015 Sorry the title says update. I meant to say upgrade. Damn predictive text.
conkay Posted March 12, 2015 Author Report Posted March 12, 2015 Ok. Do I need to put a 240 amp fuse on my new charge wire from the alternator to the battery.
conkay Posted March 12, 2015 Author Report Posted March 12, 2015 Ok. So I'm fine to hook my factory wiring to the charge post and then my heavy off the charge post to my rear batteries?
audiofanaticz Posted March 13, 2015 Report Posted March 13, 2015 Hook the upgraded power wire from the alt up to your front battery positive if you have one. You can also do a ground from an alternator mounting bolt to your front battery negative post. You can also do an additional ground from your front battery negative to the vehicles body along with the alternator ground. Then from your front battery positive to your rear batteries you run your power wire, again fusing it 16inches (or less) after the front battery, and 16inches (or less) before the rear battery to protect the power wire. You don't need to fuse the new upgrade power wire from the alternator to the battery, many people don't. But if your alternator is tucked away in a weird spot, or a decent bit away from the front battery, or your just overly cautious and like being better safe than sorry than you can fuse the new charge lead from your alternator to the battery positive. Ideally you would want to fuse at the alternators rating, or as close to it as you can, so if its a 240 amp alt, use a 250amp fuse since they don't make 240amp fuses. You could also fuse it under at 200amps which would be safer, but you do risk the fuse blowing if you send too much current through it. Fuses will take a bit more current than they are rated for for short bursts here and there so it is possible it may never fail either.
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