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#1
11-01-2014, 06:18 PM
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V/R S/G test
I'm using R.Bedell's test procedure on my 105 and have a question. When I ground the S/G to the battery I get a very slight drop in RPM's. Using a laser tachometer I measure it to be a drop of about 100 rpm's. The ampmeter meter pegs out on the positive side. Is this enough of a drop to say the V/R is defective? My other question is, the way I understand the test there are only two options. Rpm's drop or do not, leading to the conclusion the V/R or the S/G is bad. If both components are good what is supposed to happen? Thanks for the help.
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#2
11-01-2014, 06:35 PM
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If RPMs drop then it sounds like it's charging and generator is good. You need a volt meter to measure battery volts while doing this. Report back, should be over 14 volts or so, and also that much during normal operation, over 13 at least.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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#3
11-01-2014, 07:06 PM
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RPM's drop = S/G good
RPM's don't drop = S/G not good Quote:
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[B]Roland Bedell[/B] CC Models: 100, 105, 1450, 782, (2) 784, & 2072 [SIZE="4"][B][COLOR="Red"]Buy:[/COLOR][COLOR="Blue"] Made in the USA[/COLOR][/B] [/SIZE]:American Flag 1:
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#5
11-01-2014, 09:05 PM
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Quote:
__________________
(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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#6
11-02-2014, 12:04 PM
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O.K, this is what I measured. Engine off, battery voltage = 13.6. Engine running, battery voltage = 14.6. When I jump the S/G terminal "F" to the battery negative, rpm's drop and the battery voltage shoots up to 18. I only jumped it for a few seconds because the voltage appears to keep climbing. What does this mean? Thanks.
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#8
11-02-2014, 01:07 PM
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Steve it sounds like everything is working. 13.6 or so is good charging volts and yes the s/g full fielded will pump out those kind of numbers. What kind of problem are you having? No start? Weak start?
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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#9
11-02-2014, 05:57 PM
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That's good that everything seems right. Some people might call me meticulous, or something else, I'm just going though this machine one part at time and when I see a thread on testing a component, I try it. This winter I'm planning on stripping most on the sheet metal off, sandblast and paint. Also a good pressure wash and replace the wiring harness with the one that came in this week. Rebuild the PTO, and the tiller unit are next. I'm not wanting a show machine, just something that looks good and is sound for the next generation. So far I've, changed engine oil, trans fluid and filter, replaced stuck hydro valves, new points, spark plug, total steering column rebuild, S/G brushes and bearings,new tires, carb rebuilt. Probably also a few things I've missed. Electrically, the only thing I see left are the coil and V/R. Does anyone have any thoughts on changing out these last two items while I'm doing all this? Thanks for the help.
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