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A 100 watt alternator is weak.  The electrical of your car at max is probably 100 amps.  Upgrade to one bigger then 200 amps.  100 watt is a joke to even install.

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2 minutes ago, Soccerballzs said:

A 100 watt alternator is weak.  The electrical of your car at max is probably 100 amps.  Upgrade to one bigger then 200 amps.  100 watt is a joke to even install.

I own a 2009 Subaru Impreza Outback Sport that was stock a 90bamp alternator,  after days of research I came to find out the next jump for an alternator is a 270 amp for I believe 600+ dollars and I love the game but, my four kids gotta eat.  I had to sell my Harley just to upgrade most of what I have.  

  BLUF: I know my alternator is small but, its what I have unless u you know where I can get one for cheaper with good ratings.

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I'm of the opinion that rather than loading up a couple hundred dollars in the parts cannon to shotgun everything, it would be a more appropriate use of time and money to determine where you fault lies such that it can be repaired appropriately. You can then optimize from there to get the best value per dollar.

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14 minutes ago, SnowDrifter said:

I'm of the opinion that rather than loading up a couple hundred dollars in the parts cannon to shotgun everything, it would be a more appropriate use of time and money to determine where you fault lies such that it can be repaired appropriately. You can then optimize from there to get the best value per dollar.

I figured I would try to take everyones advice thus far.  I am going to use what 1/0 gauge I have left to go battery to battery, then 1/0 to two 4 gauge to amps.  Just gonna have to wait on the big 3 upgrade but i will just buy a whole kit over next few days.  Double check all my grounds and retune amps using V=sq rt of P×R and of course implied is taking the cap out of the equation.  Then, if I am still getting some voltage issues then I will look into an alternator.  But, I am going to do it in this order as time is precious in my line of work and the size of my family. 

1.  Tune amps again. And put a DMM on my grounds.

2.  Take out cap

3.  Upgrade wiring (buys time for 1/0 big 3)

4.  Look into alternator

5. Then finish sound deadening doors

6.  Then Upgrade door speakers and mid/high amp (Going with Skar speakers/amps front to rear.)

7.  Then build custom enclosure/battery box/amp rack.

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I know how it is, Gremlins after you thought you finished now it's time to play detective. Sucks but as said above start at begining.

 

I'm in the middle of a fresh build in different vehicle right after I completed one and then blew a head gasket, now none of my speakers or subs fit other vehicle.

 

Started with alt, them big 3. There's nothing in new vehicle other than alt, big 3 and xs under hood.

 

My next step is pulling doors deadening them and feeding 12g wire to them all.

Then run  power to rear, install rear battery, 

Then 2 component sets in doors 

Then amps

Unfortunately going from 2 12s to a single 8 in factory location.

 

Going with focal poly glass.

 

Anyway start at begining so you aren't spinning in circles or possibly ruining amps.

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16 hours ago, SFCMcCarty said:

I have a 2009 Subaru Impreza Outback Sport;  I upgraded to a 100 amp alternator, did the big 3 upgrade(4 gauge), added a second battery 2x OEM replacement (fused 4 gauge battery to battery), 1/0 gauge from second battery fused to 50 farad cap distributed to 2x 4 gauge one to Skar RP1500.1 at 1 ohm to 2x 12" SDR Subs and a Kicker 4 channel (Max output 600 watts) to JBL Front components and rear 2-way JBLs.  Sounds awesome but I know I can get more from my subs but, my cap shows an immediate voltage drop when the subs hit (Turned up about 1/2 way.) Result: Kicker amp goes to protect and then eventually turns back on.  Is this a ground problem (Multimeter appears to to read voltage but, dont know if anything is grounded properly(new to the multimeter game))?  Or could this be an Alternator problem?

Agree with SnowDrifter. Find and fix your problem before wasting money. First thing ... you have no need for that capacitor. Get rid of it and completely reconfigure and retune. 

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