Have this phenomenon in HGVs all the time, especially where newer trailers fitted with LED lighting is connected to older tractor units from a pre LED era.
You can be standing in the yard at night and the indicators on a trailer will be 'glowing' gently on one side.
Tractor unit is shut off completely but the leds still glow
I've asked various auto electrical people about it over the years but never managed to get a consistent answer!
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Daily drive:
2016 Infiniti QX70.....a car that's even more complicated than my last Infiniti FX to modify 
Current 'Project':
VW Crafter CR50 4 berth camper van
Previous 'Projects':
2006 Subaru Legacy Spec 'B' 3.0R,
1994 Ex-MOD Land Rover Defender, now "civilianised".
2000 Audi S8 FL
www.whall.co.uk
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