Find the alarm chirp sounder, under the wheel arch liner and behind the driver’s side headlight, and disconnect it. These Saunders have rechargeable batteries that degrade over time and short out causing a massive drain on the main battery.
Quite possibly due to the position of it. Pretty sure the rear subframe has to be dropped to change it, so all in all, quite a big job for something relatively small.
I agree though if you look at how much electronics they’ve stuffed in the wheel well, it’s understandable why there isn’t a spare.
I would prefer less electronics and proper safety equipment.
Check the condition/charge of the battery and if need be, give it a full overnight charge.
Check the connectors going into the CJB (central junction box) for signs of water ingress (verdigris).
First thing to do, locate the “alarm chirp sounder” and disconnect it. This is the most common area for a drain. Also check that the flap in the ignition barrel is closing when the key is removed.
Welcome to the forum Coby. By all means carry out a full service but also check all he air hoses are tight, secure and free from leaks or damage. Above all, have the codes read as anything else is just guesswork.
If you are 100% sure the valves are opening and closing then the head will have to come off. I would suspect worn valve seats or piston rings leading to the lack of compression in the two cylinders.
Check the fuel pressure at the schrader valve at the fuel rail, should be in the region of 55psi. Next time it happens, disconnect the MAF sensor, if it then starts straight away then there is your problem.
First and foremost, charge the battery and then see what happens. You should also consider investing in a code reader, when you think how much they charge, having your own will pay for itself after the first use.
If it’s not behind the headlight then look at the one in the driver’s side wheel well, it may well be close to falling off.
It should be at 12’o clock on the frame behind the wheel.