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| Alternator Issue | Login/Join |
DRR Trophy |
I have an East Coast Auto Electric One Wire Alternator that came off of my dragster I just sold that I want to put on my door car. On the dragster I had zero issues with it, but for some reason on this door car I have a problem. Every time I connect the cable to the alternator and fire the car up, you can't rev above around 2000 rpm, sounds like its on a rev limiter. Disconnect the cable no problem runs just fine. I'm using 8ga wire run all the way back to the battery side of the master disconnect switch. I even tried a ground strap from the chassis to the alternator housing, still runs like hell. Anybody else have a clue? Cody Harger Charger Racing | ||
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DRR Sportsman |
Is the alternator wire run with other wires? Pickup/Coil, etc or is it completely separate? I would call ECAE today and speak to them, they have more experience but to me the only reason it would do this was noise on the lines from the output of the Alt. It may not be operating correctly and the reason for the noise. 302-786-1078 slickvic@slickvicracing.com slickvic@slickvicracing.com www.slickvicracing.com 302-786-1078 Dealer for most major brands, including Simpson, Necksgen, Hans, Strange, Moser, Amsoil, Aerospace, Digital Delay, Hoosier, M/T, Goodyear, Redhorse, MSD, Racepak, Lucas, and more. Complete racecar wiring and custom CNC parts available. | |||
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| DRR Trophy |
The alternator wire runs completely seperate from all other wires, so i wouldn’t think noise would bw and issue. It definitely wasn’t and issue on my dragster where the wires did all run together. Cody Harger Charger Racing | |||
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DRR Pro |
Cody, Does the alternator spin freely when disconnected? I too would think its noise related causing a malfunction in the ignition system which you sound to be well aware of. Usually the exciting point on these is what 1200-1500 rpm? so at or above that point is where the issue arises? I would say try another one if someone you know has one. might be quicker to narrow down then. Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR S/Pro |
Just a FYI.... I had a machine last year that would not work properly and the issue was simply a spark plug! A std plug was installed in the machine instead of a Resistor plug.... That was not the first time for issues from RF noise... As we all know resistor or carbon core wires became a must have once electronics arrived in race cars. An alternator makes AC voltage and is internally rectified and regulated to DC for it's output... I personally never saw an alternator or a tach ever cause a misfire condition.... I'd be thinking the alternator has a diode issue in the diode based rectifier.....and is causing an RF on the DC output.... | |||
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DRR Sportsman |
First thing I thought too was a bad diode Ken | |||
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| DRR S/Pro |
I would agree with the other helpful ones thinking bad diode which would allow some a/c voltage into your wiring which the ignition box is seeing as noise and it is interfering with it working properly. A filter at the ignition box may help but obviously if alternator is bad you want that fixed.This message has been edited. Last edited by: Moderate Joe, | |||
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| DRR Trophy |
I’m gonna help him now, Cody your problem is not in the torque converter | |||
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DRR Pro |
X-2 | |||
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DRR S/Pro |
Back to the topic of this thread. I'm no electronics expert, but if the alternator is not putting out pure DC it will cause issues with electronics. Seen it on several cars that have come to my shop over the years. It's not very common, but it can and does happen. What ignition did the dragster have and what does the door car have? 272" Spitzer 540 Chevy The Blower Shop XR1 FTI XPM Series Converter FTI Level 6 Powerglide 3.69@199 .916 60' 2017 Bradenton Heads Up Madness Open Outlaw Champ 2018 PDRA T/D #5 2019 PDRA T/D #2 2020 Retired From T/D Competition.... 2020 Bradenton NMCA Hemi Shootout Winner 2021 getting back into bracket racing with a Gen3 Hemi powered 87 Cutlass. | |||
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DRR Top Comp |
I would try to find another alternator just to test with and that should quickly tell you if it is an alternator problem or wiring issue. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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| DRR Sportsman |
In addition to the possible had diodes, worn out brushes can cause electrical noise also. They get too worn the springs can't keep them tight to the slip rings on armature you will get static like crazy. | |||
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| DRR Elite |
Thank you  | |||
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| DRR Pro |
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| DRR S/Pro |
I've never done it but you might learn something by hooking up an Oscilloscope to the B+ post off the alternator. Every Miller Welder service manual includes waveform patterns you should see if a machine is working normally. I have been to Miller HQ's in Appleton Wisconsin......and they test every machine that goes out the door. The more high tech the machine the more parameters they test. And many are far more complicated now. I am sure today it is more computerized compared to when I was there...... The post about brushes arcing and creating static is a good one.....True.... | |||
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