Gearbox controller

Hello everyone
I have caterpillar 12h grader have problem with gearbox so after I check it I discovered that the ecu is faulty then I decided to make controller for it using relays and diode and it worked perfectly.
But I think if I us arduino it will be better
I'm not too much good in programming I write one programme but didn't work so I need help .
The input signal is :

  • Nutral
  • Drive
  • Revers
  • gear one
    -gear two
    -gear three
    The output signal :
    Selonoid A
    Selonoid b
    Selonoid c
    Selonoid e
    Selonoid f
    Selonoid g
    Selonoid h
    In this order:
    Drive one= selonoid a and f and h will work together
    Drive two = selonoid c and e and h
    Drive three= selonoid c and g and h
    Revers one = selonoid a and f and h
    Reverse two = selonoid a and e and h
    Revers three = selonoid a and g and h
    Nutral = all the selonoid off.

Is there a question? If you expect someone to write code for you, you are in the wrong place. If you want help with code that you wrote you will need to post your code with a detailed explanation of what the code is supposed to do and what it actually does. Provide a clear schematic. Read the "how to use the forum" stickies to see haw to format and post code and the kind of information that we need from you in order to help you.

Given your selector provides a 1-of-N connections to the (+12? ) supply, your diodes/relays

solution seems very sensible - how would an arduino help?

regards

Allan