K-Line Big Boy Tender Wire Harness

So my tender wire harness appears to be going bad or just plain worn out on my K-Line Big Boy (K3790-4015S). The chuffing from the tender intermittently stops and starts and the backup headlight only works when the wire is curled a certain way. Wiggling the plug with the engine on and in reverse does make the light come on and off as well so that’s why I’m assuming it’s this. I have posted a picture of the removed wire harness. Does anyone know where I may find another? Thanks in advance.