Headlights dim and return to full strength By robert1c (Read 755 times)

[robert1c]

Hi all,

I have an issue with my headlights. While riding down the road at night the lights will dim for a momment then return to full strength. I did convert the headlights to H4's but the issue going prior to the upgrade. Also this occurs irrespective to the fan comming on. Could this be a rectifier issue? I was able to buy one from friend but before I go replacing parts I wanted to see what the scooter gods thought.

Thanks for the help.

[JR]

I was reading about your issue at the "other" place and read this;

I have an issue with my headlights. While on the road the lights seem to dim then return to full strength. This is under constant throttle. Can you guys give a young pup any ideas where to look for this issue?

I have had my VOG for 2 weeks and so for I have repaired:
1) Headlights-Now running H4s
2) Sliders-Now running. Blend of 4.5 & 10.5s
3) Left hand control- Replaced/converted from the 6-pin to the Jonway 9-pin
4) Luggage box- Added box with extra tail/blinker lights

So I'm a little confused here? From my wiring diagrams the VOG and Jonway both have a 9-wire left control assembly which is the following;

dimmer switch
passing switch
horn
turn signals

Are you sure you wired it correctly? The passing light switch feeds directly off of the battery and if it's wrong it will cause this because you are mixing battery voltage with R/R voltage because the lights run directly from the R/R when the engine is running.

Yes you can have a R/R problem but it souinds more like a bad connection because it's apparent you've been working on the scooter and by going to H-4's you had to do some bulb socket changes and a bad connection will cause it to load up and come and go.

Also the connections to the headlight switch on the right side need to be checked.

The wiring out of the R/R needs to be checked and also all of your ground wires. If the battery is staying charged then it's very unlikely the R/R is bad.

Also did you have this trouble before you added the extra trunk lights? if not then there may be a issue with the connections there too?

Check all the plugs especailly the ones from the stator to the R/R and make sure they arew all making good contact.


Also this advice you got elsewhere isn't so:

Ah you have one of the big 250cc cruisers, I failed to notice that.
Your bike will have the stator located under the solid aluminum cover on the Right hand side of the crankcase for the engine when you are sitting on the bike.
because of this I highly doubt there is any contamination there that would cause your Lights to act as they do. ( there's oil behind there don't be taking it off! )

You should look instead at your rectifier. When the engine is running and the Stator magneto is spinning around all those coils of wires an alternating current is produced. This alternating current travels through those wires to the rectifier and other components where it is converted to DC current which then is used to run the accessories of the bike and charge the battery.

When the rectifier isn't working properly it doesn't fully convert your AC voltage to DC and causes the lights to have that pulse.

A quick check you can do to verify this is happening is start the scooter and with a multimeter ( digital preferred ) check any ground and positive 12V battery wire( the battery is a good place to check this at) for AC voltage.
Ideal AC voltage at the battery is 0 Volts but up to .5 Volts is acceptable ( any more and you could see things like lights flicker and analogue gauges flutter)
DC voltage is 12.6 not running 13.5-14.2 Volts engine running.



DC voltage is 12.6 not running 13.5-14.2 Volts engine running

This part is correct but as far as the R/R the AC is rectified then regulated after it is converted to DC. The Regulator part can go out and if it does then simply you'll have no charge. The AC will NOT feed to the battery unless the regulator side goes out and fuses together. If this were to happen you would quickly have a total metdown and the stator will be toast, a fried battery and blown bulbs, it's rare but does happen.



JR

[rcq78]

Robert1c, the reason your lights go dim for a second,is because it takes more power to start the fan motor,but once it's running it draws less power...I don't think there is much you can do....Bob