[RedDevil]

I tested the relay. I found it tripped at 7 volt or so, but I wanted it to trip close to 12 - the longer it allows all 6 lamps in my shunt to run in parallel, the better.
A 100 Ohm resistor in series with the (138 Ohm) coil did the trick.
It will also protect the coil when the voltage rises further than 12 Volt.
The alternative was to have the relay run parallel with one of the lamp sets, but I was afraid it would jump back and forth as the voltage over the lamps in series might be too low to keep it engaged.

If the relay is engaged it cuts 3 lamps from one feed and the other 3 from the other feed and connects them, so they run in series instead of parallel.


On the left is the power source; one wire goes to the (relay switched) plus terminal of the IMA system, the other to my buddy pack control unit.
On the right are the relay coil connectors, which are connected to the left connectors by a wire and a resistor.
Next to the right are the switched leads to each 3 lamp set.
If the relay is not engaged they are connected to the feed on the left.
If the relay is engaged they are bridged by the wire on the second left.

I made sure the contacts did not touch and locked the wires so nothing moves, yet I did push some isolation tape in between just to be sure.


The lamp unit rebuilt:


Then there was the tree that couldn't fly.
It tried and it went all wrong.
I could have told it not to try, but trees can't hear very well either.

Trees are green and hybrids are green, so the combination must be a tree hugger's dream come true.

But maybe not like this, like cut in boot size chunks.
(one was too long after all and filled the rear footwell)
On the plus, now tree huggers could hug this one tree simultaneously all over the world.
If you love fungi too hug the lowermost part of the trunk.

The workers at the municipal waste disposal started hugging the chunks with their grappler right when I dumped them in their big skip... the chance for a global community hug may already have been lost.
Anyway my hybrid is red not green.

Had to get that out while my back is still sore