Trailer direction indicator warning light

[Obi]

My 2002 defender 110 has a trailer direction indicator indicator light on the dash. Can anyone tell me how this feature detects a blown trailer globe? I suspect a voltage change dependant on change of resistance , however how does it know the trailer is connected?
cheers Obi

[Outback 1]

a voltage change dependant on change of resistance

you answered your own question it detects the extra load ,unless your trailer has leds

[Obi]

you answered your own question it detects the extra load ,unless your trailer has leds

New to this site, am learning how to navigate, not sure if Im in the right place to reply however many thanks for your prompt reply
Obi

[dullbird]

Thread moved to the defender section