MonkeyMan Posted August 5, 2013 Report Share Posted August 5, 2013 So, I've just realised that when I blip the throttle in my car, I get voltage spikes in excess of 16volts. Also, the alternator seems to cold charge at pretty much 15volts, which I feel is too high. It drops to around 14.6volts when warm.... So, whats going on? regulator on its way out? something else I've missed? The alternator casing is connected directly to the battery with 0ga cable, as is the positive output terminal of the alt. Any suggestions would be great! Thanks! Link to comment Share on other sites More sharing options...
Miguels Posted August 5, 2013 Report Share Posted August 5, 2013 check for belt slip.. is the alt aftermarket or stock? my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 5, 2013 Report Share Posted August 5, 2013 Are we talking about a spike when you are at idle and revving? Or any change in RPMs? ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Kranny Posted August 5, 2013 Report Share Posted August 5, 2013 the alts i've bought from ebay had this issue. spiking to 16v then settling at 14. Link to comment Share on other sites More sharing options...
MonkeyMan Posted August 5, 2013 Author Report Share Posted August 5, 2013 Aftermarket alternator... Sitting at idle, might be at 14.8volts, quickly rev it to ~2000rpm and let off the throttle, and the voltage spikes to 16+ volts. I dont think the belt is slipping, as there's pretty much no load on the alternator. Link to comment Share on other sites More sharing options...
RooTxBeeR Posted August 5, 2013 Report Share Posted August 5, 2013 There doesn't need to be a load on the alternator for it to slip. On 11/20/2012 at 8:54 PM, AMI CUSTOMS said: Turned mine up today at a light, guy next to me his steering wheel started moving and he looked over at me like I was a magician lol. On 5/9/2012 at 8:45 PM, skittlesRgood said: fuck the plating. look at what the main metal used is. you could buy unicorn blood plated terminals but if its just covering up dog shit, whats the point On 4/10/2013 at 12:26 PM, mrd6 said: I'll admit, half way through sanding that fiberglass in the rain and cold while I was all itchy I was definitely starting to question why i was doing this haha Soon To Be '04 Ford Escape US Alternator 280A Hairpin D4800 Under the Hood (6) XP3000's in Rear 1/0 SHCA & XS Power 4 runs to back TORK2 kit from Tony @ CE Auto Supply Pioneer DEH-80PRS DD AW6.5 (2) per door *Tweeter Unkown* DD SS4a & C3d (2) SCV4000 @ .5Ohm (2) 15" Sundown Zv5 Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 5, 2013 Report Share Posted August 5, 2013 It spikes when you let off the throttle? ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
tacomaguy1 Posted August 5, 2013 Report Share Posted August 5, 2013 He's saying when he revs it the alt spikes to 16v Belt slip wouldn't cause that...especially with no load. Alt is probably bad, contact seller/manufacture and see what's up Team Flex Issues Link to comment Share on other sites More sharing options...
MonkeyMan Posted August 5, 2013 Author Report Share Posted August 5, 2013 It spikes when you let off the throttle? drive around at 2000rpm, and its "fine" (well, as fine as charging at nearly 15volts can be) drop the revs suddenly, and the voltage spikes... (although it could be increasing the revs suddenly that causes the spike) could it really be belt slip causing this? Link to comment Share on other sites More sharing options...
SnowDrifter Posted August 5, 2013 Report Share Posted August 5, 2013 He's saying when he revs it the alt spikes to 16v Belt slip wouldn't cause that...especially with no load. Alt is probably bad, contact seller/manufacture and see what's up Or OP is idling too low for it to turn on Can you post a picture of the pulley size? Maybe a smaller pulley is in order? Some batteries/caps would help absorb the voltage spike too. Does it remain charging at 14.6 at idle or does it drop? ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
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