I have a Autopilot PCB which runs a 12v dc hydraulic pump which has been running fine until now. When the pump is not attached the output from the PCB is 12v. When i connect the pump the output drops to 4v and the pump doesn't run. Ive tested the pump and it is working fine.
Ive tested the large capacitor and it seems fine. If someone could point me in the right direction as to where I should be looking I'd really appreciate it. Thanks
Only managed to find this diagram. I will keep looking.
The power supply is a large battery bank which is fed by a 75hp diesel engine.