POS mode on switch
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Hey! I just bought a new left handlebar switch for my DT125R, it works good but the POS mode doesn't seem to do anything. I do not know how it is supposed to be as previous to buying the switch, the bike didn't have one. (I have the older switch, from 88-96) Any help is appreciated. Thank you!
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POS means position and is on the left handlebar switch, on most bikes that turns on the small bulb in the headlight but on mine it does nothing and I don't know if it's supposed to do something
@Kristóf Here's the 1989 to around 1998 3NC wiring diagram. As you can see with the lights turned to POS or On, at the headlamp switch yellow/red (main feed to the lights) connects to the blue wire for the front POS and rear light (yellow/red briefly becomes brown at the 3-pin connector just upstream of the light switch). This then connects to blue/red at the ingition switch and goes to the front POS and rear light so take a look at these wires and see if there's any abvious damage. Just before the ignition switch, blue also branches off to the speedo/tacho illumination bulbs so you could possibly learn more about exactly where the fault lies depending on if these light up at headlamp switch POS or ON.
I think this section of the wiring is also the same on bikes running the 3MB CDI unit even though the connectors from the loom to the CDI are different. Hope this helps!
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Thanks for the help, but I'm pretty sure that on these diagrams a wire branches off to another when there is a black point at the connection, so if one wire crosses another wire but there is no black point at the connection than they're not supposed to connect, and the diagram makes it like this so the diagram can be small. I haven't seen this diagram but if my theory with the black points are correct then the POS isn't supposed to turn on the small bulb as there is no connection with the left handlebar switch, only the main switch (for the stop/aux light which is working on my bike). My question is if the pos isn't connected to the small bulb, and neither to the main bulb, then what is it supposed to do/why is it there?
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Thanks for the help, but I'm pretty sure that on these diagrams a wire branches off to another when there is a black point at the connection, so if one wire crosses another wire but there is no black point at the connection than they're not supposed to connect, and the diagram makes it like this so the diagram can be small. I haven't seen this diagram but if my theory with the black points are correct then the POS isn't supposed to turn on the small bulb as there is no connection with the left handlebar switch, only the main switch (for the stop/aux light which is working on my bike). My question is if the pos isn't connected to the small bulb, and neither to the main bulb, then what is it supposed to do/why is it there?
@Kristóf You're correct about how the connections between wires are illustrated.
But, with the light switch (#23) in the "PO" or "ON" positions (PO = POS), yellow/red from the stator (main feed to the lights) changes to brown at the 3-pin connector, then at the light switch this connects to blue. The blue wire (which also branches off to the speedo/tacho illumination bulbs #32) then goes to the main switch (#24) where it connects to blue/red with the main switch in the "ON" position. Blue/red then goes to the auxiliary bulb (#26) and tail/brake light (#14) and so illuninates them.
It's confusing because the DT125R has AC lighting unlike a lot of bikes which run DC; look at the yellow/red wire coming from the stator (#7) and you'll see that after the 4-pin connector it splits into two. One side goes to the light switch (#23) and the other goes to the battery (#10) via the regulator/rectifier (#9) which changes the AC output from the stator into DC to charge the battery.
The DT125R is quite unique in this respect and one advantage of this setup is you can run a very high wattage headlamp bulb without flattening the battery. I always ran this one and even owners of bigger bikes were amazed how bright my headlamp was:
In fact looking again at the main switch #24 can make this easier to understand; when in the "Park" position, red from tha battery connects to blue/red, illuminating the auxiliary/tail lights with a direct DC supply from the battery.
Hope this helps! -
Ahhh... I get it now. So does this mean that with the main switch to ON and the lights switch to POS it should light up the auxiliary light even with the engine off? I'm asking this because my auxiliary light works when the main switch is to PARK but it doesn't work with the lights switch to POS. Thank you very much for the help!
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Ahhh... I get it now. So does this mean that with the main switch to ON and the lights switch to POS it should light up the auxiliary light even with the engine off? I'm asking this because my auxiliary light works when the main switch is to PARK but it doesn't work with the lights switch to POS. Thank you very much for the help!
@Kristóf said in POS mode on switch:
So does this mean that with the main switch to ON and the lights switch to POS it should light up the auxiliary light even with the engine off?
No, lights switch to POS with the main switch to ON only illuminates the auxiliary light/tail light with the engine running because with the switches in these positions, the auxiliary and tail light receive an AC feed from the stator via the yellow/red wire.
@Kristóf said in POS mode on switch:
I'm asking this because my auxiliary light works when the main switch is to PARK but it doesn't work with the lights switch to POS
Yes, this is because with the main switch in the PARK position, the auxiliary and tail lights receive a DC feed directly from the battery via the red wire (which connects to blue/red at the main switch in PARK).
It took me a long time to fully understand this so glad I'm able to explain it properly!
