Ever since we have had the 2003T (about 1500 hrs use) there has been no sound from the buzzer that is a combined low oil pressure and high engine temperature alarm. Now it screams when we switch power on, and silences when the engine starts. Likewise screams when stopping engine, before cutting off electric power

Also, until now the lights for the "no battery charge", "low oil pressure" and "high engine termperture" on the instrument panel all illuminated when starting, before the engine actually ran.

Now, only the low oil pressure light comes on (then goes off as soon as the engine spins over)

I was working on the alternator, and may have damaged a wire comong out of the relay box just above it, but can see nothing.

I canot even find the sender which senses low oil pressure, despite an hour of searching. If I could find it I could trace the wires
Anyone know where it is?