Is it the starter motor that is making the click? If it is, first check and make sure the battery terminals are clean and tight. If they are, follow the ground wire from the battery to the engine block to make sure it has a good ground. Don't laugh, but when it's dark out, open the hood and turn the key to see if there is anything sparking due to a weak connection.
As far as a starter relay, it doesn't have one. Power is supplied via a fusible link to the ignition switch which travels through the neutral safety switch and to the starter. If possible, have a helper turn the key to the start position while you check the black wire with a red tracer for power. It should only have 12v with the key in the start position. Additionally, make sure there is battery voltage to the black wire with a blue tracer on the starter motor.
Also, here is a link you may find helpful:
I attached the wiring schematic below, so you have a reference. I had to cut the pic in half to make it readable for you, but I did overlap the two.
Let me know what you find,
See pics below.
Images (Click to make bigger)
Sunday, May 14th, 2023 AT 9:27 PM