Boyd Posted October 7, 2011 Report Share Posted October 7, 2011 Honda's have an ELD circuit on them could be causing this problem just search about it, I have never had any trouble with it personally but something to think about. Quote Link to comment Share on other sites More sharing options...
BulletInjection Posted October 7, 2011 Report Share Posted October 7, 2011 My Jeep does this all the time. Even when I had a new alternator, belt, and wires. The only explanation I can think is that when the fan turns on it places a sudden strain and the belt slips for a second. Quote My build: http://www.stevemeadedesigns.com/board/ind...8920&st=100 http://www.youtube.com/Bulletinjection Link to comment Share on other sites More sharing options...
KickerKid58 Posted October 7, 2011 Author Report Share Posted October 7, 2011 I know that alot of little things can cause voltage drop but im pretty sure nothing should cause such a drastic drop such as what I'm seeing.. How old is your batt.? Im going to guess sence your only running 500watts you never got a new one, which is fine. But sounds like its time for a new battery. Not too sure... resting voltage is around 12.6 so im pretty sure its still good but ya never know.. Im eventually replacing the stock with an XS 5100R so i guess i just might be doin that sooner than later Honda's have an ELD circuit on them could be causing this problem just search about it, I have never had any trouble with it personally but something to think about. THIS!! I looked around a bit and found a thread on a civic forum and it sounds like you have to bypass it. Kinda pissed i might have to spend an extra $100 or so on a stupid adapter. Also says I might have to replace my ECU??? I am guessing that this ELD circuit is the case but here are some VIDS showing different times when it drops into the 12's --cruising around 50 then slow down, turn, stop, floor it to show the voltage gaining then leveling off around 40mph. heres the weird part... after that i just coast and put it in nuetral, then back to drive. cruisin on the highway, then slowing down to about 20 then speeding back up sitting in traffic, put it into nuetral, then when i put it back into drive voltage stays up until i accelerate.jumps up to normal when i floor it, drops down when i start to cruise, then bumps back up as i level off These vids give anybody any more ideas? Quote 06 Jeep Grand Cherokee 2 DC Level4 12" Soundstream TA1.3000d 4 RF Punch 6.5" Components 2 RF Punch 3.5" 2-ways RF Prime 400.4D XS Power XP950 +&-run of XScorpion 1/0 OFC My Civic Build Link to comment Share on other sites More sharing options...
1988JimmyRE Posted October 7, 2011 Report Share Posted October 7, 2011 when the car drops down like that, let it sit if it continues to go down (as in you put in drive it drops to 12.6 and after a few seconds if it goes to 12.5 then 12.4 you know your alternator is not charging and your running off the battery what are the rpms in drive, i had a build civic once it idled about 900 rpm never had a stock one Quote BUILD LOG-->1988 S15 Jimmy V8 4x4 2 15" RE Audio<--BUILD LOG Link to comment Share on other sites More sharing options...
KickerKid58 Posted October 7, 2011 Author Report Share Posted October 7, 2011 (edited) when the car drops down like that, let it sit if it continues to go down (as in you put in drive it drops to 12.6 and after a few seconds if it goes to 12.5 then 12.4 you know your alternator is not charging and your running off the battery what are the rpms in drive, i had a build civic once it idled about 900 rpm never had a stock one AHH thats what i forgot to add. the idle rpm is usually 900-1000. and someone mentioned something about the alternator not putting out voltage because the rpms are not high enough. i dont think this cant be it b/c i can drive steadily around 20-40mph with rpms sitting anywhere from 2-3k and the voltage will still sit in the 12 range from time to time Edited October 7, 2011 by KickerKid58 Quote 06 Jeep Grand Cherokee 2 DC Level4 12" Soundstream TA1.3000d 4 RF Punch 6.5" Components 2 RF Punch 3.5" 2-ways RF Prime 400.4D XS Power XP950 +&-run of XScorpion 1/0 OFC My Civic Build Link to comment Share on other sites More sharing options...
Colin - STAPUFT Posted October 7, 2011 Report Share Posted October 7, 2011 The engine rpm probably drops below the alternators "turn on" rpm. Most Alts won't put out almost anything untill they reach a cirtain rpm. If the engines rpm drops below what the car would idle at, that means the alt could just not be putting out any current. ^ this. If it bothers you or if it is causing problems, you might look into getting an overdrive pulley to spin the alt faster. Quote 12 - 12"s in the STAY PUFT 1989 Chevy Astro Build & Comment Log Un-Interrupted Build LogYouTube Channel Chevy Trailblazer 5.1 Dolby Digital DTS Install You have a beard of a mysterious sea captain. I would follow you to hell and back. Link to comment Share on other sites More sharing options...
TributaryVikings Posted October 7, 2011 Report Share Posted October 7, 2011 The engine rpm probably drops below the alternators "turn on" rpm. Most Alts won't put out almost anything untill they reach a cirtain rpm. If the engines rpm drops below what the car would idle at, that means the alt could just not be putting out any current. Sounds good to me...I've also seen 'older' hondas have idling issues (less than desired) Causing such things to happen. Other symptoms may include hard to steer-a/c cutting on/off or not producing the difference in ambient temperature that's that great...even engine vibration. Again, this should only occur on AT models and more obviously while in gear as the transmission adds a load to the engine Quote Link to comment Share on other sites More sharing options...
TributaryVikings Posted October 7, 2011 Report Share Posted October 7, 2011 Could be a diode going out on the alternator? Quote Link to comment Share on other sites More sharing options...
1988JimmyRE Posted October 8, 2011 Report Share Posted October 8, 2011 Could be a diode going out on the alternator? thats what i was thinking take it to an alternator shop, they rebuild mine around here for 25 bucks Quote BUILD LOG-->1988 S15 Jimmy V8 4x4 2 15" RE Audio<--BUILD LOG Link to comment Share on other sites More sharing options...
Jesseland Posted October 9, 2011 Report Share Posted October 9, 2011 Hey im having the same exact issue in my 2010 Civic. Just posted a thread right before i saw this one. Im getting random drops from 14.3ish to 12.2ish for no reason, stereo on or off. Quote Amp: Kicker ZX1000.1 Sub: 1 AudioQue HDC315 Box: 3.6cf @ 34hz 2nd Batt: Shuriken BT-35 Link to comment Share on other sites More sharing options...
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