No Engine Managment Light T595

Hi all
So After having the battery out of my 98 T595 to trickle charge for a few months I now have no engine managment light when I turn the ignition on. I can't even plug into TuneEcu to test for faults. All fuses are good and ignition and neutral lights are on. The engine turns over fine. It was running before I took the battery out. Also why can't you buy 4RA94001 relays?? How can I test if the old relay has failed with a used replacement as there are only used ones for sale?
Please help as I'm trying to sell the bike.
Cheers
Bernie

 

Nice one cheers

 

So after some more investigation.....
All relays good
All fuses good
Fan and fuel pump good
I put 12.7v to the coil of the power/ecu relay and the engine management light came on and the fuel pump ran. This is fed from the cam position sensor.
So the question is - Can a faulty cam position sensor cause my problem of no engine management light/no power to main relay when turning the ignition on?
Basically I have no power to the main relay

 

Ok all solved. I found 3 pins mildly corroded in the ecu. Luckily I had a spare so fitted that after cleaning up the connector. Ran the 3 hot/cold cycles and now she's running ok.