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Old 08-10-2015, 12:10 AM
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Default need some help on electrical

OK so I have 08 scion tc. I did the big 3 in front hhave 2 extra batt in the back and only running 1000w. Have a pioneer 80pr. Amp I have is a LA storm 1000.1 running at 1.4 ohm. I put a smd volt meter its connected to the amp.
What voltage should I see a friend said I should be at 14v. when I turn the car on volt meter reads 13.1 the most I have seen is 13.4v. When bass is on I see 12.8 but have seen it drop 12.1v.





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Old 08-10-2015, 12:53 AM
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all the batteries the same ago? double check voltage in back with multi meter? can you disconnect the back batts and see what voltage does?
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Old 08-10-2015, 02:42 AM
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That's weird because I'm running a ED nine.1 that's rated at 1200rms at 12.5v and with the voltage meter on the 12v outlet on my 2014 avalon it doesn't drop below 13.5v when I crank it up. It's only a 90amp alt in my car too.
Mabry your alt belt is slipping or your alt is going out. I only have a single interstate battery
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Old 08-10-2015, 02:47 AM
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check all connections first ....check the voltage at the alternator...if its still low (below 13.5v) remove the alternator and take it to the parts store and have them test it...if it comes back good then its a wiring issue somewhere...if it comes back bad...get ya a new one problem solved
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Old 08-10-2015, 03:10 AM
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When it's hot it should read as low as 13.2v
All of the Toyota cars/trucks I've had (7+) do that. They start at 14.0 is when cold then drop to low 13's when the engine bay gets hot.
Yeah I'm a Toyota guy
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Old 08-10-2015, 03:53 AM
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i have an 07 scion with a mechman alt, I don't drop as low as you though. my scion starts at about 14 volts and when it warms up, it stays around 13.3-13.6 volts.
I do drop into the upper 12 volt area, when i don't think i should. The voltage regulation system in the scion suck.
I guess to ask how many runs of wire back for positive, and negative. And what is the size of wire.


I have dedicated power and ground lines to the back 2 runs of 0 gauge each, 2 banks of maxwell caps and nsb 110 ft battery, on a 240 amp alt. I drop into the 12's at around 1800 watts or so...

I mean is it normal in a scion to go below 12.7 full tilt? I dont like reaching 12.5 volts.

Last edited by ylpkm; 08-10-2015 at 04:14 AM.
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Old 08-11-2015, 09:23 PM
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OK checked each battery on the back both rest at 12.9
Engine off Battery to alternator without 2 batterys on the back


Engine on



Battery's on the back disconnected



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Old 08-11-2015, 10:04 PM
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turn on your headlights and ac and check voltage.
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Old 08-11-2015, 10:15 PM
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Originally Posted by Turn it up View Post
turn on your headlights and ac and check voltage.
Ok will do that. With all batteries connected?
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Old 08-11-2015, 10:59 PM
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Quote:
Originally Posted by ray60218 View Post
Ok will do that. With all batteries connected?
try with under the hood batt firts then with all
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