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01-04-2018, 12:01 PM | #21 |
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Join Date: May 2010
Location: Alabama
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Re: Why does this wire Spark?
Because the alternators that are offered for 12 volt use on the model A are all negative ground. I run my roadster 12 volt positive ground with the original unmodified generator and no changes to the original wiring is necessary.
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01-04-2018, 12:29 PM | #22 | |
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Location: Redondo Beach, CA
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Re: Why does this wire Spark?
Quote:
Purdy, with your set up do you need to run a regulator of some sort, such as the one from Fun projects http://www.funprojects.com/products/10505r.aspx I run a Powermaster PowerGEN, mainly because I hate the look of a alternator on A Model A engine. If it ever goes out, I may put the generator back on with a Fun Projects regulator. Last edited by Y-Blockhead; 01-04-2018 at 12:34 PM. Reason: Added picture. |
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01-04-2018, 12:38 PM | #23 |
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Location: Epping N.H.
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Re: Why does this wire Spark?
I've only seen one person so far that that has posted the fact that there is a parasitic drain with the one wire converted alternators.It is tiny,I have one on a wood chipper that will still start in the spring after sitting all winter.I have one on my big air compressor that seems to sit a year before it is drained off.My loader has one that drains in about two months,but that one has a big spark when the wire is pulled off.I know the alternator has a problem,but it does charge and I just use the cutoff switch.If your alternator drains the battery in a couple of weeks,or makes a big spark,then there is something wrong.That parasitic drain won't register on an ammeter.
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01-04-2018, 02:42 PM | #24 | |
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Location: Alabama
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Re: Why does this wire Spark?
Quote:
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01-04-2018, 03:21 PM | #25 | |
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Join Date: May 2010
Location: Alabama
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Re: Why does this wire Spark?
Quote:
Read Keith Trues post # 23 Keith knows his stuff . The one wire alternators can and usually do have a small parasitic draw . Its not usually enough to cause a problem if the car is used on a somewhat regular basis but could cause a spark at the terminal when the yellow wire with black tracer is connected .I'm not making any suggestions only because if there are other problems I don't want to cause more . Good luck and it will probably be OK . Last edited by Purdy Swoft; 01-06-2018 at 09:29 PM. |
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01-04-2018, 03:34 PM | #26 |
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Location: Oswego, IL
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Re: Why does this wire Spark?
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I don't need a 12Volt system. It looks like if I remove the ballast resistor and drop a 6V battery back in for positive ground, I am back to stock. Does anyone thing I am missing anything?
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01-04-2018, 09:17 PM | #27 |
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Location: Oswego, IL
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Re: Why does this wire Spark?
Okay here's the answer, I ran the 12V alternator to get it bench tested and it is stone cold dead. Wouldn't even accept voltage into it. That's why it sparked.
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01-04-2018, 10:25 PM | #28 |
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Location: Alabama
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Re: Why does this wire Spark?
I would get an original generator and a Fun Projects voltage regulator . Then you would have voltage regulation . You could choose the voltage by which voltage regulator that you chose . You would still have the original look even if you chose to keep and use your 12 volt battery . I use the original type 20 amp ammeter with my 12 volt setup . If you are running a 30 amp ammeter it would still work . The ammeter only registers amps , not volts. You would need to remove the ballast resistor and use a 3.0 OHM coil. the coil would cost less than buying a new six volt battery even if you used a pertronix flame thrower coil like I use on mine . I chose to convert to 12 volts for a more powerful and reliable electrical system . Twelve volt batteries and components are readily available almost anywhere and usually less expensive . Twelve volts cranks quickly . Light bulbs are cheap , especially if you use the original style bulbs like all the vendors sell for 12 volt use . I chose the 35 watt halogen bulbs that fit the original sockets . My lights are brighter than original . It may sound complicated but it really isn't . Just a thought .
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01-05-2018, 12:34 AM | #29 |
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Join Date: Jul 2017
Location: SoCal
Posts: 53
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Re: Why does this wire Spark?
I have not had my A long, and now have a 6v alternator, LED tail lights, 12v power supply for gadgets and LED driving lights. If I would have thought about it more before buying the 6v LED tail lights, I probably would have just gone to 12v with regulator for all the reasons Purdy states.
The wiring is good except for lack of fusing. I added a main fuse and fuse block splitting the circuits. Stuffing the runs into asphalt cloth loom is a pain, but needed to look right. Make it your own and have fun with it. |
01-05-2018, 12:46 PM | #30 | |
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Location: Redondo Beach, CA
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Re: Why does this wire Spark?
Quote:
Last edited by Y-Blockhead; 01-05-2018 at 12:52 PM. |
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01-06-2018, 01:49 PM | #31 |
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Posts: 203
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Re: Why does this wire Spark?
That wire should go to the ammeter. If you are using a one wire alternator you need to forget this wire and make sure the alternator wire(s) go directly to the battery in whatever fashion you prefer. You may need to re-route the feed to the ignition switch. Don't run an alternator through the stock ammeter. It's not meant to handle the amperage and will burn out or start a fire. They were bad enough with a 20 Amp 6 volt generator.
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