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Recifier check on DT 250 B

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Recifier check on DT 250 B was created by Wessi

Tried to check the rectifier of my DT 250B. Despite of the manual, I am not clear, if it works correctly.
Connecting the Multimeter red wire to red rectifier cable and black to white, current is 1.
Reverse connection shows 3.60 Ohms. Is 3.60 correct?
Shouldn´t it be the other way around, maybe red and white cable are mixed up?
I don´t trust anything on this bike, the pre-owner did a lot of strange work. Red cable is soldered onto the rectifier
Would be nice, if you could help.
Thank you, Guido

Last edit: 19 Aug 2019 03:24 by Wessi.
19 Aug 2019 03:20 #1

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Replied by DEET on topic Recifier check on DT 250 B

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Where the Yamaha Enduro is still a current model...
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19 Aug 2019 04:02 #2

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Replied by Wessi on topic Recifier check on DT 250 B

Thank you very much, Deet. Didn´t find it using the search function.
But still Question open for me: are my cable colors correct?
Red wire to red rectifier cable and black to white rectifier cable, current is 1.
Reverse connection shows 3.60 Ohms.
Sorry, I am an electrical Greenhorn.
Best regards, Guido
19 Aug 2019 23:32 #3

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Replied by MarkT on topic Recifier check on DT 250 B

Does your meter have instructions for a diode check?

On every old analog meter I've ever had the "red" was positive on the ohm check. With the new "discount" digital meters mostly made in China, who knows? Another member recently had a digital meter that worked "backwards" on the diode test so I suspect that at least some of the digital meters are sending out DC- instead of DC+ on the red wire during the resistance check.

There are other ways to test diode using a small battery and a voltmeter... I wrote up how to do it but ran out of time and it really needs a diagram to be clear. I'll try to find something on the Internet or finish it later.
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 Aug 2019 06:47 #4

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Replied by Wessi on topic Recifier check on DT 250 B


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Replied by MarkT on topic Recifier check on DT 250 B

I've been traveling for work and have not found anything on the Internet yet...

Might be the weekend before I get a chance. Yours is probably good... here's a brief description of testing with battery...

FOLLOW THESE INSTRUCTIONS AT YOUR OWN RISK. If your don't understand something, don't try it. You could damage something.... for example if you connect your meter across a battery and have it set to "ohms" instead of "volts" you could destroy the meter!

Get a battery and test it with your meter set on VOLTS. (Not ohms!)... + lead (red) from meter to + on battery and common (black) to negative. Are you getting a reading on your voltmeter that makes sense? Yes? Good.

Okay, now disconnect the red meter test lead from the positive side of the battery. Connect the WHITE rectifier lead to the positive side of the battery where you just had the meter connected.

Now test the voltage coming out of the battery through the rectifier by connecting your red voltmeter wire to the red wire coming out of the rectifier. Do you have a voltage reading... it might be less voltage than when you connected to the battery directly... If so, good.

Now disconnect the rectifier from the battery and meter... Flip it around. Connect the red rectifier wire to the battery and and white rectifier wire to the meter. Connected like this, you should get zero or almost zero volts reading on your meter.

If it tests "backwards"... voltage flows through the rectifier with red connected to battery instead of with white connected to battery but no voltage the other way, then the previous owner has the wires backwards.

If you get good voltage it both cases then the rectifier is bad.

:Buds
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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21 Aug 2019 20:19 #6

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Replied by Wessi on topic Recifier check on DT 250 B

Hi Mark,
great help!
Thank you very much, this, even I understand.
Will check on Saturday, when I am back home.
Br Guido
22 Aug 2019 11:16 #7

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Replied by MarkT on topic Recifier check on DT 250 B

I like to think of a rectifier as basically a one-way valve. It lets the electricity flow in one direction only... a rectifier works like a tire valve on a tire.

If your compressor and fill hose ( if the stator and white wire into the rectifier) has more pressure than is in the tire (has more voltage present than is in the battery) then the air flows into the tire filling it to a higher pressure (then the electricity flows in the battery charging it to a higher voltage)

If the air in the fill hose (If the voltage in the white wire) is less than the air in the tire (is less than the voltage in the battery), then the tire valve (then the rectifier) prevents the higher pressure air in the tire from flowing back into the compressor and draining the tire (prevents the higher voltage in the battery from flowing into the stator and draining the battery.)

Hopefully that isn't too confusing... I just find it easier to work with electrical things like rectifiers when I can relate it to something like a tire valve that is easier for me to understand.
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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22 Aug 2019 12:55 #8

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