Jcd81381 Posted September 26, 2022 Report Share Posted September 26, 2022 I had a stock 125 amp alternator on my chevy tahoe running my car audio system. Uograded to a 300 amp (off-brand) and Mechman 400 amp. Now im having more voltage drop than I had with my stock 125 amp alternator. Ive checked all connections and everything is good. Only thing i can think is the new alternators arent hooked up correctly. Car audio system consists of ... *Alpine Halo 9 ilx-f309 headunit *Underground Power battery delete *Underground Power 40ah lithium *JY Power 40ah lithium *Sundown Audio Salt 3 amps (X 4) *Sundown Audio Ns v5 d2 subs (X 2) * custom Sundown Audio sub box *1/0 power wire (4 runs) *1/0 ground wire Any thoughts and/or help would be greatly appreciated. Link to comment Share on other sites More sharing options...
killerc998 Posted September 26, 2022 Report Share Posted September 26, 2022 Have you tried with just one of the alts hooked up. How are the alts wired? External regulator or internal? Any belt slipping? Link to comment Share on other sites More sharing options...
Jcd81381 Posted September 27, 2022 Author Report Share Posted September 27, 2022 Yes, each alt starts the vehicle. The 300 amp is ran off factory harness. The 400 mechman is tapped into the factory harness, 1 wire ran to ignition wire (in fuse box), 1 wire ran to charging post. When i start the vehicle the voltmeters read 14.9-15 volts. When theres a deep, long bass rhythm section, the voltmeters go into "LO", and the amps cut off. Spl Labs Bassmeter registering 145-147 dbs at voltage drop issues. No serpentine belt slip. Thabks for your response and information. Link to comment Share on other sites More sharing options...
killerc998 Posted September 27, 2022 Report Share Posted September 27, 2022 Are you running 2 runs of 1/0 power to every amp, and 1 run of ground? Looks like you need more grounds. You have 4 amps running to 2 grounds. Amps are pulling more power now then previous, and are probably looking for more ground. Wonder if amps are going in to protect. I would add grounds and recheck. Link to comment Share on other sites More sharing options...
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