Yes. Collector is at 12v

Sorry managed to measure the wrong pin. Collector is at 0v

 

Sounds like Q1 is shorted
Are the blue traces on the bottom side of the board

Blue is bottom trace, red is top

 

Then Q1 is OK.
Seems like the 555 isn't oscillating.
Check continuity from pin1 to TL-

 

Pin1 to tl- had continuity

 

Measure voltage on pin2-6

 

Pin 2-6 is 4.6v

Pin6 is 12v
Pin2 is 7.4v

 

That can't be right pins 2 and 6 are supposed to be connected together.

 

Sorry brain fart been a long day. Pins 2 and 6 are both 7.6v

 

pin2-6 needs to charge up to 8 volts to switch the output of the 555.
Check C3 and make sure it's installed correctly as far as polarity.

 

pin2-6 needs to charge up to 8 volts to switch the output of the 555.
Check C3 and make sure it's installed correctly as far as polarity.

I think we have a winner, the cap is the reverse of the footprint oddly. I will remove it tomorrow and reinstall

 

The output is now working as expected, it turns out I can't read a capacitor. The only slightly unexpected result is that the pnp doesn't turn off when the load is disconnected from the collector. Instead it continues pulsing the 7555 pulses, I expected it to pull back up to the battery voltage, which the breadboard version does.

 

The only slightly unexpected result is that the pnp doesn't turn off when the load is disconnected from the collector. Instead it continues pulsing the 7555 pulses, I expected it to pull back up to the battery voltage, which the breadboard version does.

That is the normal operation not sure why it wouldn't do that on the breadboard.

 

That is the normal operation not sure why it wouldn't do that on the breadboard.

I thought that would be the case but was just confused as the breadboard version sat with the collector and emitter at 12v when the load was removed. Either way it won't cause issues due to the load being connected via a switch.