low voltage
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=127685
Printed Date: June 03, 2024 at 9:35 PM
Topic: low voltage
Posted By: trev_topcat2000
Subject: low voltage
Date Posted: June 20, 2011 at 10:02 AM
Equipment
Optima sc34du..cca~ 750 hot is around 950
170amp alternator
Soundstream rubicon mono 1600 Rms
Soundsteeam Lil wonder 4.580
Power acoustic 40 farad capacitor
Wiring
4 gauge from - batt to engine
0 from batt to chassis
0 from battery to capacitor, 0 ground for capacitor as well.
0 to distribution block
All amps ground and power is 4 gauge
Reading
Car off- 12.91 v
Car On- 14.47v
Car on with bright lights fogs and ac 12.52v
Music on not loud soft bass 13.1 with engine fan 12.5
Medium base and mids 12.0 lights dim on dash...which gets power when volume increase..
The sub- pioneer 3000 watts reads 1 ohms so the coils are still good..
The wire from the positive to the fuse box is oem..not sure if I have to change that..
Midrange is 2 6" and 2 6*9
Help me out have no idea why voltage drops so much
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Its easy like pie
Replies:
Posted By: trev_topcat2000
Date Posted: June 20, 2011 at 10:03 AM
Car is a 90 Integra with b20
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Its easy like pie
Posted By: i am an idiot
Date Posted: June 20, 2011 at 10:15 AM
Upgrade the Big 3, and try putting the cap at the fusebox instead of at the amp. Caps are useless. But since you already have it, it may help the dimming if it is at the fusebox instead.
Posted By: trev_topcat2000
Date Posted: June 20, 2011 at 10:23 AM
I did the big 3...0 guage from the batt to the alternator...0 from battery to chasssis and also 4 from the engine to the chassis
Concerning the cap..the dimming isn't a problem but the low voltage is...it's too low for such a draw ESP when the system is low
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Its easy like pie
Posted By: trev_topcat2000
Date Posted: June 21, 2011 at 8:17 AM
Anyone
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Its easy like pie
Posted By: oldspark
Date Posted: June 22, 2011 at 3:28 AM
Measure voltage at the alternator.
1600W RMS is up to ~160A hence it is likely your alternator isn't big enough - even if at sufficient RPM and with copious wiring.
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