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#1
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hello everyone. As the title says ,I have a problem. I installed a gen. assembly(original equipment)on my carrier and am having trouble getting it to charge.I do not have the filter for it,but everything else is there.I had the gen. off to see if it would motor,and it does. The cut out looks in good shape but I have by-passed it during testing anyhow. I have battery voltage at the cutoutwith the ign. sw. on. the red discharge light comes on as well, and stays on with the engine running.On the back side of the main switch I have the "P" terminal going to the "F" wire on the gen. What voltage should I have at the P term. with the ign. sw. on? Don't I need power there to get the gen. to charge? As it is, I have no power there at any time.
Any ideas would be greatly appreciated. |
#2
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David, the P is connected to the Field terminal and the B to the armature (big wire) via the cut out.
I don't know my way around the three brush geny with the cut out, and how the cut out is wired up, but yes the field needs feeding to make it charge. good earths are also important. Power comes from the battery to make the ignition warning light go and power comes from the generator to put the light out when its charging. (opposing voltage neutralises the electron flow= light out
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Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions.... |
#3
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Lynn, that's the way I've got it wired.Thanks for confirming that for me. Now I just need to find out why it won't charge. I have an idea that the P terminal should have possibly battery voltage with maybe a resistor or a bulb in the circuit? I hope I don't have switch trouble.
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#4
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Hi Dave,
I am not an auto electrician but have you polarized the generator? I remember in my youth hanging around at the local garage the mechanic telling me "you have to make the sparks fly or it won't work" after working on a Ford generator off the car. I have copied below a bit of info I read on a hot rod website. As with all things best to do your own research to avoid frying anything but this may put you on the right track. Google "Polarizing a Ford generator" and you will get lots of hits. From the NAPA/Echlin "Manual for the Automotive Electrician", edition circa 1955: Ford-Merc-Lincoln remove Field wire and touch to Batt wire momentarily; most other cars, touch jumper from Arm to Batt at regulator. For cutout 3-brush Fords, jumper between two terminals on cutout. Cheers,
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F15-A 1942 Battery Staff Jacques Reed |
#5
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Polarizing Ford genny is an important step to proper operation as suggested.
Other than that, perhaps your genny is kaput and requires a look at by a qualified auto electric rebuilder.
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3RD Echelon Wksp 1968 M274A5 Mule Baifield USMC 1966 M274A2 Mule BMY USMC 1966 M274A2 Mule BMY USMC 1958 M274 Mule Willys US Army 1970 M38A1 CDN3 70-08715 1 CSR 1943 Converto Airborne Trailer 1983 M1009 CUCV 1957 Triumph TRW 500cc RT-524, PRC-77s, and trucks and stuff and more stuff and and....... OMVA, MVPA, G503, Steel Soldiers |
#6
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Polarization just stops noise and that's usually on externally regulated generators. If this is a 3 brush UC generator is the problem possibly because the adjustable third brush is set too far back on the armature to provide high enough voltage?
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#7
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As what Bruce was saying if it's a 3 brush generator the third brush is adjustable. I had to adjust mine a bit and then found it would do a good job of charging.
There is an entire section in the manual on rebuilding/maintenance of the generators.
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Jordan Baker RHLI Museum, Otter LRC C15A-Wire3, 1944 Willys MB, 1942 10cwt Canadian trailer |
#8
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Bruce, If your generator is not "polarised' the cut out points stay closed when you turn the ignition off. (the two brush geny has a cut out in the regulator)
The result of this is that the generator is "fed" by the battery. The generator in this situation tries to (be a) motor. The "motor" cannot turn because the fan belt stops it. The end result is that the "motor" (generator) burns out. Not much noise, but a bit of smoke! If David's geny was charging, at all, the ignition light would go out.(or at least would appear so) I have no experience with adjustment of the brush in a 3 brush geny, but I would expect it to still put out a some sort of charge, not none at all A geny that "motors" will usually be o.k. I would expect the fault to be the cut out, a wiring issue, or an earthing issue. If the geny is removed to an auto electrical shop it can be tested. The big wire on the generator is the one hooked to the battery. The little one goes to the cut out.(the cut out only has 1 wire????? The other side goes to earth on the case??? Have I got that right? In a three brush generator the third brush controls the voltage to the field windings and so the strength of the magnetic fields) The strength of the magnetism from the fields is what dictates the output voltage of the generator. I hope these snippets help, David.
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Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions.... Last edited by Lynn Eades; 25-07-15 at 10:37. |
#9
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There is a section in the Chev MB-C2 manual that talks about reverse polarity. It says that "if the polarity of the generator is reversed the circuit breaker contact points will vibrate and burn". Ii goes on to say how to polarize the regulator by momentarily connecting the GEN to the BAT terminals.
What's not clear is how the generator finds itself with a revered polarity. I expect 'new in the box' will most likely be correct...I say this because for the first two 6 volt negative ground systems I installed years ago (MB jeep and C-15A), I was completely unaware polarity even existed. It only came up when I was figuring out the differences between positive and negative ground systems when I bought my first Ford. Quote:
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#10
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Hi guys, yes,I did polarize the gen. And it is a 3 brush design. My issue seems to be more with the F wire from the gen. and what it should have as far as voltage. This is on a carrier so the switch may be different than on other vehicles. With out the engine running, and with the switch on,the field wire on the gen. should be fed by power from the battery, through a light, and to the F wire,right? As it is now,with the switch on,there is no power going to the F wire.Thanks for all the ideas and discussion.
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