Affirmative on the fuel pump cycling and the engine temp light.
The ABS lights also flash.
Just wondering if there are easy access points to get a meter on the various switches (starter, side stand, clutch).
Also, the reverse switch linkage is missing, so I'm waiting for a replacement from eBay. A few things look to have been lost while the plastics were disassembled, like the radio cover and the other small cover below that.
OK for pump cycling and Temp light warning ... so you have all "basic" starter interlocks satisfied for a start.
In such case, then is has to be EITHER:
- bad / missing wiring somewhere OR
- the reverser switch behind reverser handle - this one does NOT affect starter interlocks the same way as Neutral and side-stand
- the starter Relay itself (or related wiring)
- the handlebar starter button switch (very uncommon to go bad)
The other JOHN (Jzeiler) can help you about the reverser switch testing.
To test Side-Stand switch, it is fairly easy without any multi-meter following steps:
- Key OFF, Sidestand down, put it in 1st gear or 2nd gear (may need to rotate wheel with hand on center-stand)
- Key ON: check that Engine-temp light is OFF. Move side-stand up slowly: about half way up the temp warning lamp should go on and the fuel pump should prime.
- Key OFF: test done (although you can do more cycling of side-stand up-down if you want to confirm not intermittent.
Of course, in case of malfunction of Side-Stand switch, a multi-meter OHM function can test both logic: is the system seeing stand UP and also seeing when stand is down. There are 3 wires to achieve this double logic (see attached image with notes).
To test Clutch switch, you will be able to confirm ONLY ONCE you can have the "normal" starter function to work. When out of NEUTRAL (any gear), the engine will refuse to start unless the clutch is pulled. You can also test with a Multi-meter HOWEVER the end connector is quite far in the electrical junction box under fuel tank (below relay box).
The end connector for the right hand switch assy (with Starter button) is also in lower electrical junction box. This is covered a bit in BMW shop manual AND also in CLYMER manual.