After a lot of searching on the internet I contacted Harvest Master directly and they are going to send me a few.

I bought a spare too if anybody else runs across this issue. PM me if you want to buy it!

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COzigzag Reviewed by COzigzag on . Harvest Master RCA Cable Splitter I'm sure I'm confusing myself and this is probably a very common item to find. I'm looking for an RCA cable splitter that is used with the Harvest Master Climate Controller. It has a male end that connects to the controller and splits into 4 female ends. This splitter is often pictured with the Harvest-Master Relay - 240 Volt which is sold separately. Thanks for any advice! Rating: 5