Mosin Posted February 15, 2010 Report Share Posted February 15, 2010 Setup is in my sig. with a completely stock electrical system. stock 100 amp alt, no big 3 yet etc... Today I was driving and barely had music almost half way up and out of nowhere the voltage starts jumping from 9 volts all the way to 14.6 volts. i pulled over pulled off faceplate and problem stopped. i put faceplate back on and it does it again... took the alt to auto store and they tested it twice and it passed. put the alt back on, did a positive run from alt to batt in 0g and a 4g run from batt to chassis. (ran out of wire) tried it again and still voltage 'jump' I tried a little 100rms 2 channel amp on same power run and ground and it worked just fine. what can be causing this? Did I do something to the amp? bad ground? bad batt? The alt take the load of headlights, defrost, fan on high just perfectly. Car idles at 14.6V and when off batt sits at 12.7. I need to know if I need to get ahold of Sonicelectronix for warranty. Ive had the amp for a week if not that. When I played the amp the voltage only dipped below '13' when i had it almost full tilt. but that was reading from the gauge on dash. at normal vol. it didnt dip or dim once. gain is about 1/4 way up if not a notch higherr and bass boost is just notched a little. Someone please help me Quote Derp. Link to comment Share on other sites More sharing options...
Gotloud555 Posted February 15, 2010 Report Share Posted February 15, 2010 Since you have try another amp, and did have much that issuse then the amp might have a lemon on it.. Quote Link to comment Share on other sites More sharing options...
Mosin Posted February 16, 2010 Author Report Share Posted February 16, 2010 What do you mean a lemon? Quote Derp. Link to comment Share on other sites More sharing options...
treossi Posted February 16, 2010 Report Share Posted February 16, 2010 should check your ground location might be killing bat.. might be killing alt.. no big three... could be a lot of things Quote Team sundownWESTCOASTSPL.COM we're throwing dbdrag events very soon visit the website for details Link to comment Share on other sites More sharing options...
blackrosetiger Posted February 16, 2010 Report Share Posted February 16, 2010 (took the alt to auto store and they tested it twice and it passed.) waste of time an auto store does NOT test an alt under load just FYI. but with the voltage jumping like that could be a bad ground. Was it dropping everytime the bass hit? Quote 1998 Plymouth Voyager (daily) Jensen VM9213 H.U. (I Know but I havent had any problems.... yet) 5.25" Factory -> Sound Stream SST5.2 6x9 Hifonics ZXi 693 -> Sound Stream SST6.9 Amp: Class D: Crescendo 3KWP (x2) Class A/B: Crescendo 1000C4 Sub: Almani S-7 10" (x6) Link to comment Share on other sites More sharing options...
Boon Posted February 16, 2010 Report Share Posted February 16, 2010 Sounds like a short in the system somewhere... amp might be on the way out. Quote 10.x volts fo' life! Link to comment Share on other sites More sharing options...
ziggetyzag26 Posted February 16, 2010 Report Share Posted February 16, 2010 i had the same prob and come to find out my ground was loose on the front batt Quote Lost prophets carclub DD for life Visit my youtube My link Link to comment Share on other sites More sharing options...
sully Posted February 16, 2010 Report Share Posted February 16, 2010 It sounds more like a ground issue than a bad amp but I would exchange it since u just got it. Paying shipping one way will be well worth it if it ends up being an internal problem. Quote 2003 Ford F-150 Reg Cab layin body on 26's 2003 Tahoe 3/5 drop on 26's with a 408cid Supercharged engine. 2011 Camaro 2SS 2005 VW GTI Stage II ECU, CAI, 3" turbo back exhaust, FMIC, lowered 2" on some plastidipped 18's 2003 Hayabusa lowered, stretched, cams, nitrous and custom paint Link to comment Share on other sites More sharing options...
Stallion Marauder Posted February 16, 2010 Report Share Posted February 16, 2010 Sounds like your new amp is drawing alota power for the alternator to handle. Their always a solution, replace the alternator with a higher output alternator depending on the alternator your car can handle it should be anywere from 165 to 200 amps.. Anyways your definitley gona notice a less voltage drop.. Oh forgot to mention im assuming you have dual two ohm subs powered down into 2 ohms? Ohms's law also play a big roll in voltage drop.. Quote 2003 Mercury Marauder Black (R.I.P) Tinted Windows Purple HID's 10000K Fog Light HID's 10000K Swi Jack Steering Wheel Controls Apple I-Pod Classic 80GB Alpine KCE-422i Full Speed I-Pod Cable Alpine IVA-W203/P1 Navigation/Bluetooth Alpine PKG-M780 7' Headrest Screens Alpine PXA-H701 Sound Processor Alpine MRP-F300 4 Channel Amp Rockford Fosgate 1501bd Power Amp 2 Kicker L7 15' Solo Barics Alpine Type R SPR-17S Component's Alpine Type R SPR-57C Coaxial's Monster Performance RCA's 0/2 Gauge Wires BIG III W/Fuse 200 Amps Custom Built Alternator Yellow Cap Optima Battery Front Xstatic Batcap 800 Back Custom Mounted Bass Knob LED's 2x License & Trunk Light BoYo VTK-350 Color Backup Camera Dynamat Xtreme Front Doors & Rear Deck Clifford Matrix 50.7X Alarm System/Remote Start Link to comment Share on other sites More sharing options...
Mosin Posted February 16, 2010 Author Report Share Posted February 16, 2010 (edited) Nope, dual 4's wired at 1-ohm final load. and i did the big 3 upgrade and tried the amp again and had the same jjump. Like i said I was bumpin at a low vol and then outta nowhere my voltage dropped to 9 back to 14.6 then kept doing it. I unhooked amp and it stopped. The alt takes the full load of a/c on, headlight on, 100rms amp full tilt, fan full speed, with no prob. doesnt even hesitate. I double checked power for shorts and found none. I was advised by Maxxsonics not to hook amp back up or else i woulld try diff ground. I sanded sheetmetal first and everything. Thing is my ground waire is like 2 to 2 and a half foot. Idk if that plays any part but the amp worked perfectly for the few days i had it hooked up. subs are okay they still work, thats what the 100rms 2 channel is powering now. Could my amp just be a lemon like suggected? edit: oh and the voltage was jumping everytime the amp saw power. even with all rca's, speaker cable unplugged Edited February 16, 2010 by solo_x18 Quote Derp. Link to comment Share on other sites More sharing options...
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