Sunday, March 25, 2012

Replacing Daelim S1 Regulator Rectifier

A few weeks ago, the battery in my scooter went flat for the second time in six months.  I was able to recharge it with a plug-in charger, so I figured there had to be something preventing the battery from charging.
Some research on the Scooter Community forums indicated that the regulator rectifier often fails on this model, leading to progressive loss of charging as well as unreliable starting.

Daelim S1 charging system
Daelim S1 Charging System
 The Daelim service manual shows how to remove and test the regulator, so I pulled it out and found that the resistances were all wrong.  Voltage was leaking through and discharging the battery, so I ordered a new regulator from the dealer.

Daelim regulator rectifiers
Standard regulator (left) and upgraded one (right)
The new regulator is much bigger than the old one, with a heavier heatsink.  This should make the new one less likely to overheat.

Standard bolt (left) and new one (right)
 To fit the bigger heatsink, the standard bolts need to be replaced with longer ones.  The new bolts are metric 6 x 25mm hex-head bolts, zinc plated.

Daelim S1 upgraded regulator rectifier
The regulator mounts to the same location, with the bolts attached to threads on the scooter frame.  Besides the longer bolts, nothing needs to be moved or modified.

The wires pass behind the frame and connect to these two plugs on the right-hand side of the scooter.

Since replacing the regulator, the battery is keeping its charge and I can rely on getting started in the morning.  As long as you have a decent tool kit and refer to the service manual, this should be an easy home repair.

6 comments:

anon said...

hey, thanks for the post.
do you know the part number for the regulator? I can't seem to find anything on the number that is showing in the image.
many thanks,
grant.

Unknown said...

31600-SAB-0000-M Is the part number. You can buy it here, fixing my sisters right now. http://koreanbikeparts.com/index.php/genuine-daelim-regulator-s1-125-sv125-vj125-vjf250-sn125.html

amagni said...

I ordered it through the Australian importer, didn't know the part number. Hope you found one!

Unknown said...

The wires is the same???

amagni said...

The wires is the same???

Yep, it was just a straight plug and play job. The only difference was the new one needing longer bolts to attach it.

Unknown said...

May I ask who the Australian importer is? My regulator just died on my S1. :(