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What relay goes here

What makes you think something should be there? Just because it is empty?

Wiring looms don't always have every branch in the loom, providing a specific function or being connected to something, as looms are used in more than one application.
 
It’s a 2015 and I’ve fitted the MPH wiring , there is a spot on the frame for a relay and though I realise the harness may be somewhat generic the spot on the frame for a relay makes me suspicious. The former owner has messed with it (poorly) and I’m in the process of undoing his modifications. It has the starting issue and he wired a seperate switch directly to the starter which works but is crude . I would rather get rid of it but every time I try switching via a relay I get a resounding clunk from the stater solenoid and no cranking. Might try making new and heavier battery cables next
 
Just so you know there is more clips on batt box than you have relays, you have extra clips. Use the wiring diagram to figure what you don't have. If you are not able to do this, take it to someone who can.
I have changed wiring looms & that's how it's done in the real world. Good luck figuring out what PO has done.
 
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