
Last Updated: 30 May 2025
Kato Class 800 FL12 Light Function Decoder Install
Mistakes may damage your locomotive, controller or other accessories. Use a multimeter to make absolutely sure you have completely isolated the motor from the track before testing. Always use the Programming Track for testing. Our guides are provided for reference only, and you proceed entirely at your own risk. Unsure about something - try our DCC Conversion Service instead.
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This guide shows how to install the Kato FL12 lighting function decoder into the driving cars of the Kato N Gauge Class 800 models.
This guide covers all versions of the Kato N Gauge Class 800 models, which are identical other than the liveries applied:
- Class 800/0 800021 in GWR Green (5-car set) (10-1671)
- Class 800/0 800010 'Michael Bond' in GWR Green with Paddington Bear branding (5-car set) (10-1673)
- Class 800/2 800209 in LNER white/red (5-car set) (10-1674)
- Class 800/1 800113 in LNER white/red (9-car set) (10-1675)
Step 1 - Remove Decoder Cover
Turn the driving car upside down and unclip the cover.
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Step 2 - Fit Decoder
Orientate the decoder so that the side with two contact points at the top and bottom is showing, and the small black chip is towards the back of the model.
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Slide the decoder in, making sure it goes all the way in and that it is over the copper spring, not below.
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Step 3 - Refit Decoder Cover
Clip the decoder cover back on, and test it on your programming track.