The relays should be under the center cover with the "Champion" lettering. From what I can see it looks like the top set of fasteners on each side may hold the center cover in place.
I'd start by disconnecting the battery then, removing those fasteners to see if the cover will come off.
It might look something like this:
Each one of those is a relay. In this example they are single pole, so it takes 4 of them to do all of the switching to do power in and power out.
Yours *might* have just 2 relays, in which case they would be dual pole.
Either way all of that mechanical switching mess could be replaced with a solid state unit like this:
'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.
I've tried them all... Jeeps are still the best. (0||||0)