55.2-59 Radio question

[55Trucker]

My truck came with a new harness, but the factory AM radio wasn't hooked up. The wiring diagram that I see in the factory assembly manual doesn't show a radio at all. I managed to find and download the radio service bulletin for this truck and radio (#987187). The radio itself has 2 wires coming off of it. The service bulletin shows two wires also, one labelled "Lead A", and the other "Dial Light Lead". (Unfortunately, it doesn't indicate which color wire is which.)

The new dash harness has no where that I can see to connect these wires. Does the dimmer wire go directly to the headlight switch? Is "Lead A" connected to ACC power somewhere?

(Also, the cigarette lighter is also not connected to anything, and the harness also does not seem to have a place to connect it. Where should this be connected?)

Thanks!