I recently got a new customer who has a Kohler stand by whole house generator 18KW 100amp breaker. It's mfg date 09/12. The last electrician replaced the motherboard in the board in the transfer switch twice the issue is when the power goes out the generator is not starting automatically automatically he has to go out and manually switch it. When he hits the run button on the generator it starts right up every time does its job it's just not automatically transferring.Even after the motherboard and the transfer switch was replaced the issue was still there so now I'm jumping in after another electrician and the only thing I can think of is it's the controller on the generator itself I called Kohler and since I'm not a licensed distributor with color they were limited on what information they could give meOn the generator the low voltage DC end there's AB which are the 2 communication wires and then there's power and common on the power I'm getting 14 V I've taken the battery off batteries fine cause the generator starts up on run when I go to test B I'm getting 3 V I'm pretty sure I should be getting 14 V on B and then when the generator kicks on I should be getting 14 V on a and nothing on B. My problem is I'm trying to determine if it's the motherboard againOr if it's the top side control on the generator it's a generator. The Is top side control is $1300And the motherboard and the transfer switch is only 500 I really don't want this customer spending all this money on a new controller if that's not the issue you I'm having a hard time How to determine if it's the motherboard in the transfer switch or the controller on the generator itself. Is any in all advice is much appreciated thank you.