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1969 AT1E charging/lighting issue.

03 Feb 2020 19:21
Bradshaw
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1969 AT1E charging/lighting issue. #21
Mark and all, and for future reference for others.

Found the problem regarding why the system was not charging the battery.

I should have checked the carbon brushes first instead of the regulator. The carbon brushes, believe it or not, appeared original and were all of 1/4" long, so worn the wear marks were gone. The OEM new one's I bought are about 1" long were obtained by a person in Singapore. Not real cheap but had to have them.

Replaced all 4 and now the battery charges up, the lights brighten a bit when revving etc. A side note, I was shocked when I started it up as it appeared to be a small pin wheel of fire/sparks behind the plate but they soon went away. I assumed the brushes were just seating on to the commutator. The AT1-E Runs great now and charges the battery. I'll keep the used regulator I got of eBay for a spare.

Next up I will be rejetting the carb as the altitude at my new venue is about 5k feet. Will also be replacing the points with a new set. Hoping I won't have to redo the timing when I replace the points. But if I do I'll figure that out too. I'm not a mechanic by trade, so going real slow and deliberate.

Thanks to all for the advise and suggestions.

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03 Feb 2020 19:27
MarkT
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1969 AT1E charging/lighting issue. #22
Congratulations!!!! :likey :likey :likey

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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04 Feb 2020 00:42
Gr8uncleal
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1969 AT1E charging/lighting issue. #23
Probably worth cleaning the faces of the new points - they often come with some sort of "film" over them. Quite a few posts already on this.

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04 Feb 2020 09:20
Bradshaw
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1969 AT1E charging/lighting issue. #24
I had no idea about the film on new points. Thanks for that tip! Does changing the points out with new points require resetting the timing?

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04 Feb 2020 10:09 04 Feb 2020 11:19 by Lizeec.
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1969 AT1E charging/lighting issue. #25
The reason you saw a sparking pinwheel of sparks is what I am explaining below

I use to rebuild electric motors for electric forklifts, they sell what is called a commutator stone and you run it over the commutator while the motor is running, it’s job is to clean up the commutator.

You can liken it to like resurfacing a brake rotor or flywheel on a car, so you have a smooth clean surface for the new brushes to ride on, if you use new brushes on a old dirty out of round pitted, grooved commutator you will be replacing those new brushes very soon, similar to changing brake pads on a rotor that hasn’t been resurfaced.

Another option is if you have access to the commutator with the brushes out just run some emery cloth on the commutator to clean up the surface area so the brushes have a smooth surface to make good contact on and the brushes won’t bounce around and create sparks and wear down prematurely and damage the commutator.

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20 May 2020 09:00
sportfully
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1969 AT1E charging/lighting issue. #26
I have a 69 AT1 and I am in the process of diagnosing and have zero volts coming out of my regulator. i dont have the manual but want to perform the full fielding generator test. can you share this procedure with me?

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20 May 2020 09:32
MarkT
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1969 AT1E charging/lighting issue. #27
Go to the Tech Library link at top of page... you'll find several manuals that describe the procedure.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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20 May 2020 10:41
sportfully
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1969 AT1E charging/lighting issue. #28
ok I will check it out. my full fielding test results had an output of 5 to 8 volts at the disconnected A terminal with the F terminal grounded. i'll check the manuals to find specs to make sure i did it correctly.

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