ammeter

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nbsbbaker
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Zip Code: 30467

ammeter

Postby nbsbbaker » Sat Nov 18, 2017 4:18 pm

My 51 has never charged since I brought it home 3 years ago. I didn't worry about it much since I kept a charger on it. I started working on the electrical system recently and I'm the type of guy that likes to start with a good baseline so I had the generator rebuilt and I replaced the VR, wiring harness, ground cable, plugs, plug wires, coil, points, condenser, distributer cap, light switch, and dash fuse. I currently have the headlights off and will rebuild them soon. (no taillight yet). Before I cranked it up, I polarized the generator. When I pulled the starter switch, the ammeter needle showed a slight discharge which is normal. After cranking, it runs fine but continues to show a slight discharge on the ammeter. The battery is showing static 6.13V. I am not convinced my charging system is working but before I start running tests I wanted to understand the system better. Will the ammeter show a discharge until the battery falls below a threshold, then show a charge?

tst
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Re: ammeter

Postby tst » Sat Nov 18, 2017 4:33 pm

follow the chart, note one is for a regulator and the other a cut out relay so make sure to pick the right one
Attachments
08-Regulatortroubleshootingchartrev.gif
07-Cutouttroubleshootingchartrev1_0.gif

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Drfting1
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Re: ammeter

Postby Drfting1 » Sat Nov 18, 2017 6:21 pm

Have you tried a new battery

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Glen
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Re: ammeter

Postby Glen » Sat Nov 18, 2017 7:45 pm

Hi,
The ammeter should show charging as soon as you speed up the engine enough that it will begin to charge, which is faster than low idle speed, which should be 500 RPM.

Try using the flow chart, like Tim said above. You could have gotten a defective voltage regulator, new parts can be defective. :)

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Lorisfarmer
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Re: ammeter

Postby Lorisfarmer » Sat Nov 18, 2017 8:13 pm

nbsbbaker wrote:My 51 has never charged since I brought it home 3 years ago. I didn't worry about it much since I kept a charger on it. I started working on the electrical system recently and I'm the type of guy that likes to start with a good baseline so I had the generator rebuilt and I replaced the VR, wiring harness, ground cable, plugs, plug wires, coil, points, condenser, distributer cap, light switch, and dash fuse. I currently have the headlights off and will rebuild them soon. (no taillight yet). Before I cranked it up, I polarized the generator. When I pulled the starter switch, the ammeter needle showed a slight discharge which is normal. After cranking, it runs fine but continues to show a slight discharge on the ammeter. The battery is showing static 6.13V. I am not convinced my charging system is working but before I start running tests I wanted to understand the system better. Will the ammeter show a discharge until the battery falls below a threshold, then show a charge?


:Dito: My '51 has the same problem and I've addressed it the same way - I keep a battery tender on it all the time. I too would like to solve the charging problem, so I appreciate the info and chart that has been posted. I think this may be one of my "winter projects!
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." Sir Winston Churchill / George Orwell.
1951 Farmall Cub
1969 IH Cub Cadet 106
1971 Bolens 1253-01
1998 John Deere LT 155

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clodhopper
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Re: ammeter

Postby clodhopper » Sat Nov 18, 2017 8:23 pm

If you dont show charge at half throttle, check your belt tightness. If your belt is good, follow the flow charts.

nbsbbaker
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Re: ammeter

Postby nbsbbaker » Sat Nov 18, 2017 10:25 pm

Thanks to all. I'll follow the chart and see where it leads. Perhaps someone can tell me how construct a hood off fuel tank so can run the engine and have access to the generator posts and the backside of the VR?

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Don McCombs
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Re: ammeter

Postby Don McCombs » Sat Nov 18, 2017 10:34 pm

Here's one that I made from a lawnmower fuel tank.

Image
Don McCombs
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Bob McCarty
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Re: ammeter

Postby Bob McCarty » Sat Nov 18, 2017 11:43 pm

Just remember that the carb inlet threads are 1/2-20. Most barbed fittings for rubber hose are 1/4" pipe thread. You'll want to use one of the brass gas line fittings (1/2-20) with 3-4" of steel line to slide the rubber hose onto.
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we need to think differently."
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inairam
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Re: ammeter

Postby inairam » Sun Nov 19, 2017 9:05 am

nbsbbaker

Follow the flowcharts. very import and help full.

From what you have done at this points I suspect the regulator.

I have given up on the replacement regulators ( the cheap ones and the expensive ones) and replace them with a solid start one from a company called Clover out of California.

Here is a link to my solid state regulator project. viewtopic.php?f=1&t=94792&hilit=regulator
When you only have 9 horsepower you need to know the names of all of the ponies!

nbsbbaker
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Re: ammeter

Postby nbsbbaker » Sun Nov 19, 2017 9:08 pm

Regarding the auxiliary fuel tank, I should be able to find an old lawnmower gas tank around here. Where do I get a fuel shutoff valve? NAPA, ebay, generator/lawnmower repair place?

staninlowerAL
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Re: ammeter

Postby staninlowerAL » Sun Nov 19, 2017 9:24 pm

My local auto parts and lawnmower repair ships have the shutoff valve in stock. If your tank has a threaded outlet try a local hardware store. They should have small threaded quarter turn valves. Here's one I installed in the fuel line after the sediment bowl for example:
Valve+2.JPG
Yours doesn't have to be this complicated but you can see the idea.

brewzalot
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Re: ammeter

Postby brewzalot » Mon Nov 20, 2017 8:51 am

pony tank mount.jpg
pony tank mount.jpg (66.62 KiB) Viewed 272 times


Another mounting option

nbsbbaker
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Re: ammeter

Postby nbsbbaker » Mon Nov 20, 2017 9:02 pm

my local lawnmower repair had an old lawnmower gas tank. I mounted it on the fold out shelf on a 6 foot stepladder. Ran fuel line from the tank, thru a plastic shutoff, to the carb. Works quite well for next to nothing. Tomorrow, I start with the flow chart. Wish I had some of you looking over my shoulder.

inairam
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Tractors Owned: 1948 with international 1000 loader
1949 with kub klipper belly mower.
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1965 lo-boy with c-3 mower
1975 with homemade mower
Memberships: Rough and Tumble Engineers Historical Association;Chapter 8 IH Collectors; IH Collectors Worldwide
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Location: Glen Mills PA

Re: ammeter

Postby inairam » Tue Nov 21, 2017 7:56 am

Maybe that can be a new feature, "Looking over my shoulder', on the website - A person can schedule a live stream of a repair and have people comment on what we are doing in real time!

My money is on the regulator.
When you only have 9 horsepower you need to know the names of all of the ponies!


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