update - i went back out to the car and observed that the P light had gone out and the amps on fuse 75 were zero. Then just as previous the P light came back on and sure enough the amps on fuse 75 went back up to nearly 1 amp.

I am hoping that i have found the problem. I have left fuse 75 out, and have now got a meter on the battery terminal - just waiting for it to go back into sleep mode....

fingers crossed...