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  #1  
Old 06-23-2015, 11:43 AM
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Questions about big 3 upgrade

I have a 2011 overland with the 5.7, about a year and a half ago I installed a JL W7 prowedge powered by a JL slash 1200 v3. At time of install I also put in an optima yellow top and kinda half assed the big 3 upgrade. When I really crank the stereo I notice that the lights dim like crazy and I can sometimes hear the amp clipping this is usually followed by me turning down the volume to protect my equipment. Shortly after the initial install I added a capacitor which I know is not the answer but it did seem to help a little. I would LOVE to eliminate the capacitor!!! My questions are, should I have gone from the alternator directly to the battery under the passengers seat or was going from alt. to piggy backing the + jump location acceptable? Also the grounding points look pretty weak to me should I maybe weld in a 5/16" or 3/8" stainless stud and mount to that? I also just remembered that I never hooked up an engine block to chassis connection which im sure will help at least a little. I also feel that my amp grounding location could be a bit better as well. Is a 1200 watt amp too much for this alternator possibly? This setup has always bothered me as im not usually one to half ass anything but at the moment I was unsure so I left it and never completed the job which is what I'm looking to do now. Any help would be great!


Red wire on bottom is my 1/0 piggy backed to the jump location





Left is going to my cap/amp right is factory wire from piggy backed jump location



Factory battery to chassis ground looks weak to me



My amps grounding location



Yellow top

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  #2  
Old 06-23-2015, 07:02 PM
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Re: Questions about big 3 upgrade

Greetings,

Hit the link on the bottom of my signature page for my audio build. You will see the pictures and description of the install. Basically, we tapped off the charging posts and run the wire to the back. The battery that I have running my amps is undersized for what you are doing. The alternator is constantly charging the battery and it does not effect any other systems while the OE battery is working fine.

With the JL Audio Slash, you are going to need a lot of headroom since the draw will reach 100 amps. The alternator that you have, i believe is rated for 210 amps. In this case, a secondary battery will be more efficient than a cap.

Best for now.
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Old 06-23-2015, 07:35 PM
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Re: Questions about big 3 upgrade

Thanks for the reply! I'll check out your post, I've heard that adding a battery can be beneficial but to my understanding it's still just putting a bandaid on the problem. This is my first time dealing with an amp of this size so there is a bit of a learning curve for me.
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Old 06-23-2015, 07:59 PM
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Re: Questions about big 3 upgrade

Greetings,

Not a problem.

The battery is not a bandaid rather a solution. Many upscale installs use a combination of batteries depending on how much bass is being pushed out.

With my 3 amps, I push out a total of 1200 RMS if I hit that and my peak music power would be way over. The battery I have is sized for my application. If you add another amp latter for the vocal end, then you will have to size accordingly. Sometimes will find installs that have both batteries and caps.

Keep the work up and lets us know how it turns out.

Best for now.
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Old 08-15-2016, 09:02 PM
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Re: Questions about big 3 upgrade

So its been a long time since I visited this issue but since I pulled my sub and amp out of my jeep due to my recent encounter with a black bear and my jeep being sent to a body shop Ive decided to figure this out once and for all before I reinstall my equipment. Has anyone else done the big 3 upgrade on their wk2? The factory wiring from bat+ to under the hood bat- to chassis and alternator to chassis seem huge but the connecting points seem very small (look like just a 1/4x20 stud or similar) Im thinking about welding in some 5/16'' studs. My goal is to eliminate dimming lights, I installed a capacitor around the time I started this post which definitely helped but didnt completely fix my issue, I hate caps and want to eliminate it. I am not opposed to adding another yellow top as I think I can fit another one in the battery compartment under the passenger seat but Id like to exhaust all possible alternatives before I shell out another $200 for a second battery. I had my amp way under tuned and would like to tune it closer to its potential and being a 1200 watt RMS amp I really want to get it right this time. any more info would be greatly appreciated. Thanks guys!!!
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Old 10-04-2016, 09:25 PM
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Re: Questions about big 3 upgrade

Batteries act like buffers, they absorb shock in a way which would be the peaks of current draw. You will always have drain issues if you are sucking more juice than the alt produces. Get a bigger alt and do as short runs as possible for the ground, the bigger the ground plane the better for less resistance.
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