Trailer lights without ignition

[rustynuts]

Originally Posted by SeaComms

And just to round it out I changed the fuse for the D pillar power socket from Ignition to Permanent Power as per the owners manual, and same as US models the trailer connector is now live all the time. I even stated this to the service girl yesterday and she said nooo, that wont work.

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When you do the fuse swap to Hot, does that mean there is a permanent current draw?

[SeaComms]

The rear socket would be live always but no draw there, the brake light controller I believe are just relays switching the either ignition or permanent power incoming feed.

Since nothing else runs from that fuse it wont be hard to replace the fuse with my amp meter and see! Will report back shortly...

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[SeaComms]

OK curiosity got the better of me. I suspect it is a solid state switching system rather than relays as there is a small residual current draw. However 0.0044ma (or 4.4 micro amps) is not going to bother me

For comparison for those who cant draw a perspective, a single LED like an alarm indicator draws around 3 to 4 ma and is usually flashing at 50:50 duty cycle so would average around 2ma draw. Thats nearly 500 times more than I measured.

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