[RedDevil]

Monday morning I did the morning commute with the lamps in series.
They did glow up nicely on switching on, then for the rest of the drive I did not see any light in the mirror. Hm. Battery charge level resided one bar under max. It did some EV mode and some light forced regen - just for short bursts.
At work I checked on the lamps. They were lukewarm. So they did something, but not much.

I ended up at work with a 3.6 l/100km average. Not bad, but I've seen better without EV support!

On my commute back I hooked up the battery directly to the IMA system, thinking (without a meter at hand to check it) that the voltage on my buddy pack should have sagged enough to not make it throw codes on the IMA sytem.
And it did not. I could run it on the highway, even got in a bit of a jam, without any codes whatsoever.
But the economy wasn't there either... and the battery charge level actually dropped a bar!

When freed from the jam the average consumption hovered around 3.0 l/100 km, but it showed erratic drops to low 2s. Nonetheless, fuel consumption remained fair but not spectacular.
A long wait at a traffic light did not throw a code.
Only when nearly home, braking for another traffic light did it suddenly trow a code.
I parked it immediately after the lights (where there was a parking spot) and reset the system and switched the pack off.
Again my FE for the trip home was good for the conditions, but not spectacular.

Tuesday morning I decided to put the lamps back in series again hoping to see the light strength in the mirror (the morning commute is in the dark now). But the lamps refused to even glow!
I disconnected everything and just rode it to work and back without support.
Both commutes were 0.2 l/100km worse than yesterday while the weather was warmer.

I measured the voltage of my buddy pack when home. It had sagged just a little, to 118.2 Volt. It would have lost less than 10% of its charge on Mondays commute!

I found that the cause for the lamps not lighting up were the tab connectors on the wires I used to hook up the lamps - the same that hook up the 32 Amps fuse.
I had ground the tabs on the double filament lamp narrow to the ¼" width of the connectors, but the thickness of those tabs had made the connectors bend out a bit and they did not connect properly to the slightly thinner contacts of the fuse and 6 lamp batch (for which I used the connector of the blown H7 lamp).

A friendly nudge from a pair of pliers and the connectors were tight again. The lamps lit up with a golden yellow glow. Tomorrow there's another chance to test them.