UHF interference

Might be worth making sure both radio's have a good earth. check to make sure the connections on the antenna cables are OK. If the antenna has been shifted lately, you may need to play with location. This is only basic stuff. Plenty of better experts than me out there. Local radio suppliers/fitters have seen it all before. Give one a call and have a chat. Good luck

Hi there Shaun!

Explain the I/F. Is it only doing it when the car is running? Is it a buzzing noise? If it is a high frequency buzzing noise, then you are getting bleed-through from a stuffed ground plane on the RF cable. Replace the cable if this is happening as it could be that the shield is open-circuit or touching the body.

Typically, I shun wiring direct to the battery. it's messy (potentially DANGEROUS!) and not required. This is because you normally have many accessories that are to be wired-up to the truck and typically these end up in a bloody mess. Get it sorted out properly (don't rely on auto-electricians, as most of them are bleep -house) and distribute the power through the truck correctly..

My Patrol has only the main power feeds to/from the battery and management system. It then flows into a 140A resettable 12V breaker (lower-drop than fuses!) then down through some 130A Welders cable to a distribution block at the back, from there, a fuse system distributes the power throughout the truck.

Where are the mynah bird traps Shaun?

Cheers Matt