Amart88 Posted May 2, 2013 Report Share Posted May 2, 2013 I just noticed that when I rev my engine in the blazer the voltage goes down and takes a few seconds to come back up. The needle will be at 14.5 or so and when I rev it goes down to 13 ish. I have a d3400 under hood with big 3 done. Stock alternator for the time being. Is this normal? The d3400 is floating at 13.2 when truck is off. My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
Ben Fultz Posted May 2, 2013 Report Share Posted May 2, 2013 Any belt slip? Link to comment Share on other sites More sharing options...
Amart88 Posted May 2, 2013 Author Report Share Posted May 2, 2013 Any belt slip? Not that I noticed, don't hear it slipping. My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
ric006 Posted May 2, 2013 Report Share Posted May 2, 2013 maybe bad alt or bad batt auto part store can test both Link to comment Share on other sites More sharing options...
ric006 Posted May 2, 2013 Report Share Posted May 2, 2013 kind of vehicle my be a computerized regulator Link to comment Share on other sites More sharing options...
Amart88 Posted May 2, 2013 Author Report Share Posted May 2, 2013 kind of vehicle my be a computerized regulator I don't think its computer regulated as it charges at 14.5 constant. My last car WAS and this is nothing like it so far. I asked mechman and they said that this year and model (2005 Blazer)does not have computer controlled voltage. Is there a way I can test the Alternator myself? I just bought the D3400 2 weeks ago and it seemed fine. I hope it's not that :s My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
SnowDrifter Posted May 2, 2013 Report Share Posted May 2, 2013 Measure your voltage with a DMM. Make sure it is actually the charging system giving you issues and that you don't just have a bad gauge ~~~~~~~~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...
Amart88 Posted May 2, 2013 Author Report Share Posted May 2, 2013 Measure your voltage with a DMM. Make sure it is actually the charging system giving you issues and that you don't just have a bad gauge Ok, I will do that tomorrow. My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
Amart88 Posted May 3, 2013 Author Report Share Posted May 3, 2013 UPDATE: Still no luck. Ok, I just went out and did some tests, - The belt seems fine, no slippage. - My connections are all tight - When I have DMM from altertator stud to battery negitive the voltage stays the same and works as it should but when I just read the battery terminals the voltage goes from 14.5 to 13.2ish when I let off the gas. - I Checked resistance from alt to battery on DC Volts and it seems fine 0.00v (I got mixed results) - I checked the resistance of my grounds to the frame and I really got mixed results. If I go from alt case to (dirty) frame I get crazy resistance but if i go from alt case to the bolt I used for my frame ground its perfect 0.00. Heres how my Big 3 wwas done. All 1/0. - 300A fused run from alt to battery positive. - Ground from battery negitive to frame and the from frame (same bolt) to alt bracket. Yes I sanded the frame, used a star washer under the lug and coated in lithium grease. I don't know what else to check or that I could try. I really hope it is not my battery as it floats fine and is brand new ... I have not had it load tested yet but I want to try everything else first... Thanks My 2005 s10 blazer build. 4 zcon 18's walled. Link to comment Share on other sites More sharing options...
Kyblack76 Posted May 3, 2013 Report Share Posted May 3, 2013 It drops when you let OFF THE GAS, or when you rev? "14.5 to 13.2ish when I let off the gas" SMD SUPER SELLER The Burban Build Blazer Build sold Acura trunk build sold Link to comment Share on other sites More sharing options...
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