Hello, I have a similar problem on my JCB 8065 from 2012 with electro proportionnal hydraulics. The AUX Switch command (the button) on the LH joystick doesn't work anymore. I can't switch from from the boom of my excavator moving to the auxiliary circuit to have my shredder working. Before, when I pressed the button, I had the AUX light appearing on my instrument panel and a buzzer sound at the same time. Now, pressing this button makes nothing. Looking at the electrical scheme, I have been testing : - the joystick button with an ohmmeter --> OK - the voltage arriving to the button (5V) --> OK - the solenoid coils (as in your 1st scheme above, n°3) with an ohmmeter --> OK - the voltage arriving to the coils (12V) --> OK - I bought a new 5V regulator --> nothing changed - I tested the AUX resistor with an ohmmeter --> OK - I tested all the relays with an ohmmter and with a 12V battery to hear the "clac" --> OK - I tested the buzzer relay with an ohmmeter --> OK I did those tests looking at the electric scheme from the 8065 Midi Repair Service Manual sheet from C-48 and C-50 pages. In the C-50 page, the only thing I didn't test is the AUX CONTROL ECU4 and the AUX DIODE A & B because I don't think it might be the problem. Am I right or wrong ? Can you / anyone help ? I don' tknow what to do / test anymore ... I can't attach the scheme but can send it via email if needed. Thank you
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