ASV 4810 electrical gremlin

[Bison]

All 3 hydraulic warning lights came on out of the blue on a cold start and won't go off unless the key is in off , running or not, hot or cold
filters are clean, oil is fresh and there's no overheating problem either.
Wiring diagram tells me nothing, all wires are by number and it is near impossible to tell what goes to were.
Service manuals are conveniently non existent.

Were to look

Anybody?

 

[mkandl]

I am new here and just saw this... The 4810 problem you discussed sounds like the engine oil pressure switch PN 0310-083 has failed which can cause all three lights to come on and the tach to quit working. The replacement switch so this does not happen is an updated part PN 0314-028. Hope this helps!

 

[mhtmtree]

I am new here and just saw this... The 4810 problem you discussed sounds like the engine oil pressure switch PN 0310-083 has failed which can cause all three lights to come on and the tach to quit working. The replacement switch so this does not happen is an updated part PN 0314-028. Hope this helps!

I have the same problem with my 4810...Where is the oil pressure switch?