Reply To: 2008 GV125C headlight/running issue

[♠️ MARCELAdministrator Topics: 32Replies: 194Joined: Nov 30, 2017@mf448kxn6 Location: North UKRiding: GTRPoints: 2,564]

Hey,

As Daniel says too, I have my suspicions on the regulator.  How about this, what i’m about to say is direct of the workshop book I have been reading…

1. Start the bike, Rev to 2.5 – 3,000 rpm.  It “MUST” say  14.5 or over
   Any 13v readings whatsoever = The regulator needs inspecting/replacing.
   OEM rating = 14 – 15 (15v best)
2. What lights do you have ? – main headlight bulb must be 55w max  (Some OLDER GV bikes need 35w instead)
3. Depending on your model – If there is a “HYOSUNG” 30/20A relay on it, inspect that one too.   I know it’s on ALL GTR bikes to power their dual lights.
4. Battery will be 12.8volts when bike is OFF (charged)
5. Switch on the bike -> Don’t start -> Put All lights on.  The battery must not DROP by 1 volt.   (12.8 dropping to 12.6 is normal)

Let us know how you get on!

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