wondering what it would cost to repair a power source 75 amp 12 v supply that I came to find out had "0" volts coming out of it after buying a used motorhome that it came in. The name of the motor home is an HMC [Hawkins Motor Coach] a company that is now out of business. The supply is used to supply voltage to all the 12 volt accessories on board...reading lights,sink water pump etc. thank you.