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Hello All Been lurkin for a few week ? about ammeter and alternator I have 31 sedan that I inherited from my grandfather and the ammeter will go from pegged discharge when it starts to pegged charging then the fuse would blow when I go to rev it up to pull out. So I put a 30 amp breaker on it same scenario pegs it trips the breaker then the car shuts off. I've used the search function but can't find anyone with the same scenario. There is a condenser in the distributor and I've tried to get the timing down with the nurex wrench. Timing Definately not near where the woody idles but it has its own set of problems. I put new plugs in it and it backfires as well. There is a 6 volt alternator as well
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator Need to excite the alternator!?
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator It seems that there may be something wrong with the alternator. Try taking the wire off the alternator and starting the car to see if you get the same issue. If the problem goes away with the alternator disconnected, you can take it to an alternator shop (if you can find one) to have it looked at. Or get another alternator.
It may be a 12 volt alternator on a 6 volt car. It may be a fault with the wiring like a bad ground or loose connection somewhere. Or there may be a short somewhere. If the problem persists with the alternator disconnected then look for a short. There may be a short in the horn or somewhere else. Try disconnecting things one at a time to see if you can isolate the cause. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator thanks all Nkaminar I'm in Western nc too down in Polk.
Does anyone stock a 6 volt alternator like oreilly advanced autozone napa? |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator Quote:
I am about 2 hours west of you, if you are in Polk County NC. We should get together. It sounds like this is your first Model A. I would be glad to travel over there to help you out, if you want. Some basic electric system troubleshooting will pin down the problem very quickly. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator Jim, that's what the Model A hobby is all about. You are willing to travel two hours to help out a newbie. Congrats to you!!!
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator I could use the help. Im overwhelmed right now trying to keep them running and i have one more to get out of the weather. I cant get that one(coupe) to start at all. It'll turn over just wont run. Ive got spark at the points. These things sat for 2 or 3 years without moving. I drained the gas out of the tanks but not the carbs. Anyways back to this one that started the thread. The sedan i disconnected the alternator and the ammeter just showed a slight discharge. The number on alternator says 12v negative. Is there a way to test the output voltage of the alternator?
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator Here is part number of alternator. Maybe the problem is this car has been converted to 12v?
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator 1102394 37a
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator Quote:
You need to get the goop from old, stale gas out of the carbs. Remove the carbs, spray the jets with carb cleaner followed by compressed air and put them back on the engine. Original Zenith carbs are held together by only 1 bolt; easy to take apart and put back together. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator The OP has a major short to ground. That's what burns fuses. The fuse protects the rest of the circuit. The alternator may or may not be involved but something inside would likely be burned melted or damaged enough to create a dead short. Inspect the charging circuit from stem to stern. It could be anywhere in system portions that are not switched. Lights, horn, and electric wiper are isolated if not switched on. Ignition has to be on to run but a short there won't let it run.
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator I cannot travel to you to help right now but I posted what I did to get a car running that had sat outside for 5 years. See https://www.fordbarn.com/forum/showthread.php?t=329463
You have a short somewhere. Disconnect all the wiring and use your multi meter to find the short. Google the alternator part number to learn if it is 12 V or 6 V. What voltage battery is installed? The 6 volt battery will have 3 caps on top for filling with distilled water. The 12 volt battery will have 2 caps that fill 3 cells each for a total of 6 cells. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator Which battery post is grounded to the frame??
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator All 6V alternators are converted from 12V, and the case stamping isn't changed. The part number is rather meaningless since it is different for the make/model it was originally installed in.
You need to identify what type system you have, starting with the battery. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator One thing to remember, the Model A is originally POSITIVE ground. If you dropped a battery in, not knowing that, it would definitely create some havoc. As said above, some alternators have been converted to 6V positive ground so looking at the markings isn't really going to tell you much. Most coils will have a polarity marking on them, usually a + on one side of the primary. If the + is going to the distributor then than is an indicator that it is still positive ground. For sure disconnect the alternator until you figure it out. If you bring the alternator to a competent shop they can tell you if it has been converted. By the way, once you figure this out, DOCUMENT it, put a tag on the alternator and somewhere else on the car. This happens SO often, people make "improvements" to the car and leave no documentation for the next guy. Hydraulic break conversions are the worst for this. Also download a wiring diagram, use the search function here on Fordbarn, they have been posted many times. Good Luck!
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator The stock electrical system is here in detail. https://www.mafca.com/downloads/Semi...ex%20Janke.pdf
It is a good resource but your electrical system may have been changed. Common changes are the ignition switch wiring and conversion to an alternator. |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator Be careful you don't burn out the ammeter. Original ones are hard to find. If it goes to 30 amp it is a replacement already.
Charie Stephens |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator The position cable is on the negative battery post
the ground cable is on the positive post The ammeter is a 20amp one How many grounds are there?I'll check the schematic I'm pretty sure its still a 6 volt system all the batteries have been 6 volts |
Re: Hello All Been lurkin for a few week ? about ammeter and alternator Ground cable is attached to trans bolt. I wirewheeled it this am to make sure ground didn't have paint.
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Re: Hello All Been lurkin for a few week ? about ammeter and alternator Check grounding between alternator and battery post. Lack of common reference can lead to high voltage between them. Run AWG #12 between alt. case and battery ground post if necessary.
On a similar note, since battery ground has been moved to the bell housing, you also need a connection between ground post and frame (at least #12) for lights and horn. |
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