Hello Everyone, I have a 2000 LS400, I installed a GPS double din head unit, pioneer avic-8100nex, best head unit ever, especially for this vehicle. I also have a 1000 watt 4 channel, amp, and a 3000 watt sub amp. Alpine 250 x 4 running Focal components, And 2 Sundown Audio X10 10" each running 1500 watts rms and sundown audio 3000 watt amp, Pushing 3000 watts at 1 ohm.
Thats just a background, I also have a second battery in the trunk, optima yellow top. My alternator went out, which i was expecting, and i had it rebuilt to 220amps. So I added some wiring when I installed everything, and wondering if everything is correct because now I need to replace my main battery, I believe so anyways. Everything was running perfect for exactly a week. Then My 3000 watt amp shut off while idling. and I noticed my battery light blink. when I got on freeway all was fine, 3000 watt amp turned back on etc. I went to napa to have battery tested and it showed 10.3 volts and 200cca out of 600cca, I had left the car running ....Just wanted to get home when I heard that. He said to disconnect wire connecting batteries to get ideal readings. I figured I'd take them both out and test them out of the car. The underhood battery was already in the car when i bought it 18 months ago. I assume this battery needs to be replaced regardless, I hope I didn't damage the Yellow Top, If thats even possible?
but here's how I wired it.
This is factory
Alternator = factory 6 gauge goes to under hood fuse box, Then From Fuse Box factory 6 gauge goes to positive battery Terminal.
Ground = Engine Block to Chassis To Negative Terminal on Battery.
My Additions are just that, I did not change the factory Wiring,
Alternator = 0gauge/1ought wire from Alternator Straight to Positive Terminal on Battery
Ground = 0gauge/1ought from Enginge block, to Chassis to Negative on Battery Terminal
Battery underhood=
Positive Terminal = 0gauge/1ought wire to Battery in Trunk Positive terminal
Battery in Trunk =
Positive Terminal = 4 gauge to 1000 watt 4 channel amp under passenger seat where factory amp,Ground to Chassis
0gauge/1ought Positive Terminal to 3000 Watt Amp
Negative Terminal = 0gauge/1ought to Chassis
0gauge/1ought to 3000 watt amp Ground
Main questions are= *Wiring straight from Alternator To Underhood Battery to Much/ Overkill? Or even Necessary?
*2nd Battery in trunk, should It be identical to underhood battery? Or keep Yellow Top And Add a Battery Isolator?
*Should I run 0gauge/1ought from Alternator to Trunk Battery, And Remove Ogauge/1ought that Connects Batteries?
*If I keep Batteries Connected with 0gauge/1ought, Should I run Negative 0gauge/1ought between Both Batteries?
*Something else I should Test?
I apologize it's so long, I like to be thorough and include all information I have. If there's something I missed, please let me know and I will reply asap. My intentions are to handle this later today. Thank You for reading
