Icom UHF

The wiring is very simple, positive and negative and no memory wire.

I think you answered your own question.

I have the same radio I think (IC400PRO) and when it was initially installed it was same as yours. Off with the ignition and you then have to manually turn it back on.

I went back and got them to wire it direct to the battery. Now it is on all the time which is MUCH more convenient. When going on a day trip it is amazing how many times you actually stop and start and cycle the ignition. With the radio hooked into ignition circuit it became really annoying to keep turning it on.

You may be able to get it to turn on with the ignition but even this would annoy me as often you want the radio on when at a campground so you can hear ithers returning to camp and so on.

The radio only _Affordable_Storage_Drawers.aspx something less than 300Ma when on standby so there is very little risk of flattening battery with radion on all the time. It would need to be on for at least a week to make a dent in an avaerage 55 amp hour battery.

My advice is to just go with a fused direct connection to your battery or even better to second battery. Radio can run all the time or just for your trips away.

Muddy

Hi,
I have the IC400pro with the programming software. Mine is wired to the second battery so can be left on permanently, with no impact on the main battery's ability to start the car.
The radio can be set (without the software) to turn the transceiver power OFF automatically after 2 hours when no key operations are performed or receiving no signal. This is done by going into set mode on the radio and working through the menu.
I quickly checked the software and cannot see how you would set it to come on with the car if it was wired as a conventional accessory. I find when travelling it is quite good to leave the radio on when stopped.
Cheers
Andrew