I have a 93 civic with a 70 amp alternator. Right now the alternator is producing too much voltage( up to 20 volts) I suspect that my 900 watts rms stereo system(mtx tc 4001 front chan. @ 4 ohms rear chan. @ 2 ohms, mtx mxa6001 A 2ohms) is to blame. So I decided to get a HO alternator, but the closest guy that does it is in brampton a few hours drive. After doing some homework I found out that added a second isolated battery may provide better protection. Does anybody have any advice, pros or cons and what would you do? HO aternator, Second battery or both? I have already upgraded my battery and wireing for those who will ask.

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1933 honda civic dx
Security: compustar 2way
Head Unit: Alpine 9885
Amps: MTX mxa6001, MTX TC4004
Wiring: stinger
Mids & Tweeters: mb quartz rc216
Sub: 12" ssd fi audio in custom ported box(2.6 cu ft) tuned to 32 Hz
SPL: 139.3 at the dash at 38hz 138.7 with music tested with a term lab mic

I would get your alt fixed first. Charging at 20v will toast the battery within minutes.

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Chris
Alpine F1, PPI, IDMAX

yeah i know it's an intermittant problem, so I've got a little time. on vacation too so I can use the GF's car if I have to. There doesn't seem to be a trigger for it either. sometimes it does it right away sometimes not at all. I only noticed it a couple of days ago, and trying to save some money. I can get a new one for about a hundred bucks, have the old one remand into a HO for $175 or buy a HO for $275. But I'd have to drive down to brampton for the HO cause I havent found anyone reliable here(oshawa,whitby,ajax etc)

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1933 honda civic dx
Security: compustar 2way
Head Unit: Alpine 9885
Amps: MTX mxa6001, MTX TC4004
Wiring: stinger
Mids & Tweeters: mb quartz rc216
Sub: 12" ssd fi audio in custom ported box(2.6 cu ft) tuned to 32 Hz
SPL: 139.3 at the dash at 38hz 138.7 with music tested with a term lab mic