Ammeter/Main Voltage Fluctuating
#1144379
12/26/11 05:11 PM
12/26/11 05:11 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
OP
master
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OP
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Joined: Jan 2003
Posts: 5,444
Indiana
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I started a new thread focusing on just my ammeter issue. The below car has an issue with the ammeter bouncing around from just left of the center mark (1/4" or so) to the positive side of the ammeter about 3/4 up on the guage. At idle, the ammeter is bouncing back and fourth fairly fast and when I bring the idle rpms up to around 1400rpms or so, the guage smooths out. The main volage gauge is jumping back and forth between 13 to 15 volts just as fast as the ammeter is bouncing. From another thread, I changed out the voltage regulator and the ammeter and the voltage gauge is acting the same as before the swap. Do I need to pull off my 1 year old alternator and have it checked? Thanks
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: Andrewh]
#1144383
12/26/11 06:51 PM
12/26/11 06:51 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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Indiana
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I am using the stock wiring harness except that at the bulkhead, I had to bypass the blue wire around the bulkhead last year due to a burnt connector. Since the bypass, it ran fine all last year. This came up on my last thread so I will throw it out there. I just installed a MSD ignition box and on the 12v switched feed to the MSD box, I connected three wires, the RUN blue wire (goes to the alternator/VR), the brown CRANK wire, and I also wired in the voltage guage that is showing a fluctuation of 13.5-14.5. These three wires are what is feeding the MSD 12v feed. I asked a MSD tech about wiring the voltage gauge in on the 12v supply and they said that it would be fine. I am not 100% sure on this as other board members have questioned it too. Thank you.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: YO7_A66]
#1144384
12/27/11 07:14 AM
12/27/11 07:14 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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On a difficult case like this one I'd use some jumpers directly: 8ga from alt to batt positive terminal (or starter relay), jumper from batt positive terminal to VE sense terminal. Jumper from batt to alt blue field wire male terminal. jumper from alt green field wire male terminal to VR side terminal. jumper from vr case to batt neg post and jumper from alt case to batt neg post. If it is now straight then remove 1 jumper at a time to pin down the offending circuit. If it's still acting up w all jumpers connected which is what I think it will be doing then that points to the alt. EDIT said VE but meant VR (voltage regulator)
Last edited by RapidRobert; 12/27/11 08:13 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Ammeter/Main Voltage Fluctuating
[Re: cuda-sweden]
#1144386
12/27/11 12:29 PM
12/27/11 12:29 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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I have the old alternator that was working before I swapped in the higher amp unit from Powermaster. I might remove the PM unit and take it in for a test or swap in the old unit to see if I still get the voltage fluctuations. Thanks allot.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: Andrewh]
#1144388
12/27/11 04:46 PM
12/27/11 04:46 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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I just found that 78a unit on the O'Reily web sight. I will pull this one and have it tested and then decide what direction to go.
Thanks allot
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: autoxcuda]
#1144390
12/27/11 06:16 PM
12/27/11 06:16 PM
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Joined: Apr 2010
Posts: 4,154 bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
I guessing you'd want a stock looking alternator. But this denso unit off a Suzuki Samauri is awesome. Sooooo steady at low low rpm.
details?? same brackets? what size belt? any alignment issues?
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Re: Ammeter/Main Voltage Fluctuating
[Re: autoxcuda]
#1144391
12/27/11 06:23 PM
12/27/11 06:23 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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If there is a problem with this PM unit, I am going to give them a chance to fix it. It puts out 63a at idle and with all of my lights on plus brakes, my ammeter never moved, until now. It is still under warranty and I am not driving the car right now, so I have some time.
Please give some info on the Denso unit. Does it mount the same as a stocker? What is the idle and the total amp rating. Where did you buy it? Thanks to all.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: YO7_A66]
#1144393
12/27/11 06:59 PM
12/27/11 06:59 PM
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Joined: Jan 2003
Posts: 27,471 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
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Posts: 27,471
So Cal
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Quote:
...
Please give some info on the Denso unit. Does it mount the same as a stocker? What is the idle and the total amp rating. Where did you buy it? Thanks to all.
It's rated at 46-50 amp. Plenty for a car with no A/C, no p/w, high amp boombox stereo, etc... My car stock was rated with a 36 amp.
http://www.partsgeek.com/gbproducts/MC/1...eek+Google+Base
IIRC, I've seen them on Ebay for like $60 within the last year. If you moparts search my username and denso alternator I linked to the ebay seller that has/had them for a good deal.
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Re: Ammeter/Main Voltage Fluctuating
[Re: YO7_A66]
#1144394
12/27/11 07:06 PM
12/27/11 07:06 PM
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Joined: Jan 2003
Posts: 27,471 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
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Posts: 27,471
So Cal
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Quote:
If there is a problem with this PM unit, I am going to give them a chance to fix it. It puts out 63a at idle and with all of my lights on plus brakes, my ammeter never moved, until now. It is still under warranty and I am not driving the car right now, so I have some time.
Please give some info on the Denso unit. Does it mount the same as a stocker? What is the idle and the total amp rating. Where did you buy it? Thanks to all.
I've heard some power master customers that have been unhappy. Especially for the big dollars they get for thier units.
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Re: Ammeter/Main Voltage Fluctuating
[Re: autoxcuda]
#1144396
12/29/11 07:23 PM
12/29/11 07:23 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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I took the Powermaster alternator to my local NAPA store today and it tested perfect on the machine. He said that the numbers could not have been better. He then tested my backup alternator and found it to be putting out too little voltage down low. I put the alternator back on the car and I made some voltage checks with the key in the ON position. The battery was at 12.0, the alternator was 11,85, and the blue wire at the VR was 11.8, volts. I am at a loss as to what to check next. I am going to review my wiring before the MSD swap to see what wires were being bypassed at my ballast before and see if I am missing something on my feed to the MSD 12v red wire. Could I have an issue with the blue 12v wire/s that would cause the ammeter to fluctuate? Thanks again,
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: Ammeter/Main Voltage Fluctuating
[Re: mikemee1331]
#1144398
12/29/11 08:46 PM
12/29/11 08:46 PM
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Joined: Jan 2003
Posts: 5,444 Indiana
YO7_A66
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OP
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Joined: Jan 2003
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Indiana
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The dual brown wire has 12v at crank and at run. I am thinking of adding this back in. I will seperate the MSD 12v gauge to see if that helps too. In the back of my mind, I am thinking of pulling the front harness and checking the wires for any issues. I hope that I don't have to do this but it is Winter and I could do it in the house. thanks for the reply
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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