BassMunky Posted July 28, 2017 Report Share Posted July 28, 2017 what can cause this? when driving no music playing it spikes. like .3.4 volts than stays at one voltage. example 14.3 14.6 14.5 14.7 14.5..... Shakin not Stirred....my buildhttp://www.stevemead...ngle-cab-build/412 CVX And put a sealed enclosure in your trunk cut a hole in your deck and call it ported Link to comment Share on other sites More sharing options...
8ten8 Posted July 28, 2017 Report Share Posted July 28, 2017 Maby regulator is on the Fritz. What's your voltage at full tilt? From a noobs point of view, I'd be pretty fond of driving round town, no load at 14ish. Link to comment Share on other sites More sharing options...
WalledSonic Posted July 28, 2017 Report Share Posted July 28, 2017 Which car? You may have a PCM controlled alternator. Chevy Sonic Wall (4) 15's on 10k Build Log https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/ (4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts Jeep Wrangler JK (4) 8's in a 4th Order Build Log https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/ IG @walledsonic Link to comment Share on other sites More sharing options...
BassMunky Posted August 4, 2017 Author Report Share Posted August 4, 2017 2006 tacoma stock alt bought a new one stock. doesnt do this all the time. also at a light no music playing it drop down slowly sometimes. from 14.7 to 13.9 sometime Shakin not Stirred....my buildhttp://www.stevemead...ngle-cab-build/412 CVX And put a sealed enclosure in your trunk cut a hole in your deck and call it ported Link to comment Share on other sites More sharing options...
BassMunky Posted August 11, 2017 Author Report Share Posted August 11, 2017 bump Shakin not Stirred....my buildhttp://www.stevemead...ngle-cab-build/412 CVX And put a sealed enclosure in your trunk cut a hole in your deck and call it ported Link to comment Share on other sites More sharing options...
WalledSonic Posted August 11, 2017 Report Share Posted August 11, 2017 Your alternator is probably PCM controlled. The computer may vary your alt output based on a number of factors. Damn near everyone with a newer car has to deal with this issue. There are modules out on the market, but not for every make and model. Chevy Sonic Wall (4) 15's on 10k Build Log https://www.stevemeadedesigns.com/board/topic/209412-2015-chevy-sonicwall4-15s10klithiumlarge-case-hairpin-us-alts/ (4) Fi SP4 15's | (2) Ampere 5Ks | Active! | Arc KS600.2 & KS125.2mini | CDT Silk Domes | Silver Flute 8s | 240Ah JY | US Alts Jeep Wrangler JK (4) 8's in a 4th Order Build Log https://www.stevemeadedesigns.com/board/topic/209841-shadow-2016-jeep-wrangler-jk4th-order4-8sdc-35klarge-case-hairpin-us-alts/ IG @walledsonic Link to comment Share on other sites More sharing options...
BassMunky Posted August 18, 2017 Author Report Share Posted August 18, 2017 bumppp Shakin not Stirred....my buildhttp://www.stevemead...ngle-cab-build/412 CVX And put a sealed enclosure in your trunk cut a hole in your deck and call it ported Link to comment Share on other sites More sharing options...
Mitchaford Posted August 18, 2017 Report Share Posted August 18, 2017 On 8/11/2017 at 7:07 AM, WalledSonic said: Your alternator is probably PCM controlled. The computer may vary your alt output based on a number of factors. Damn near everyone with a newer car has to deal with this issue. There are modules out on the market, but not for every make and model. That is the best answer you're going to get. My car used to do it when I had my stock alt. The PCM would down my voltage when I would idle at lights. Drop from 14.0 to 13.3. You're on the lucky end of the spectrum. Your voltage is high for a stock alt. I just replaced my alt with a HO one about an hour ago and hot it reads 14.4. So you're reading higher than me and I have an aftermarket alt thats not even PCM controlled anymore. 2008 VW Jetta Team Fi 12 CT 4000.1 CT 125.4 PWX 6.5 80 PRS EB Flex 2/0 Second Skin ^^^ Build ^^^ Link to comment Share on other sites More sharing options...
Smoove Posted August 18, 2017 Report Share Posted August 18, 2017 I am seeing this with 2 different brand self exciting alts. NOT computer controlled ( from 14.7 to 13.9 ). what I did notice is that when a load is being applied the stay level, even a constant RPM levels them out. I wont list the brands right now. Both are hairpin self exciting and I think both have an LRC of 2.5 or 5. not sure if it has something to do with self exciting regulators. 2 Team Fi 15's v1 2 DD M5's 970amps of Alt 6th order blowthroughThe truck Blowthrough build : http://www.stevemeadedesigns.com/board/topic/155555-smooves-1996-chevy-ext-cab-c1500-slow-build/The 350z build : http://www.stevemeadedesigns.com/board/topic/170694-smooves-2003-nissan-350z/ My FB page https://www.facebook.com/pages/Smooves-Car-Audio-and-performance/719746144805343 Team Fi Audio http://www.ficaraudio.com/ Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted August 18, 2017 Report Share Posted August 18, 2017 I wouldn't worry about .3 or .4 volts. There are a lot of things that need power in a car that might turn in or off. This will change the load the alternator sees. Like radiator fans power steering pumps and power brakes (maybe). Differences in ambient temperature will play a role in alternator cooling which will effect output. Does any one get a rock solid 14.7v all the time? 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
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