1997 Peterbilt 379 clicking sound while driving

Hey guys, I got a 1997 Peterbilt 379 with a 3406e model CAT. While driving over about 20mph I hear a click sound coming from somewhere in the cab on the driver side as if it would be like a circuit breaker or relay. But I checked all fuses and relays and everything checks out and also checked each ground that I know of. I really don’t know what could it be at this point, tried checking anything behind the dash panels and everything looks good too. Wondering if there’s anybody else that has had this issue or point me in the right direction for this. The only thing I’ve done to the truck recently is pull the stock steering wheel and out an aftermarket one on but to eliminate that I even put the old steering wheel back on.

 

I’ll go through the truck again today while working, so if a relay is really hot, should I lean towards that relay being the issue?

 

it’s just a one click that happens every minute or two. Same click while driving and can’t get it to click while I’m at a full stop to really try to pinpoint it from where it’s coming from.

 

I’ll have to try that out forsure tonight while working, thank you!

 

That is something I read somewhere else, should I fill it up with refrigerant and see what it does or maybe replacing the A/C clutch relay? I’ve actually never used the A/C im always with the windows down. I barely have a little over a month with the truck