Turns out it was because I didn't have the power antenna leads
connected. I thought power antenna referred to raising the
antenna when the radio is powered on, but this wouldn't apply to
this car since the antenna is in the rear window. Once this was
connected, my AM radio was back.

"Paul Vina" <paulvina@comcast.net> wrote:

>It sounds like your antenna isn't grounded properly. Check the antenna base
>for rust and make sure it's seated directly to the sheet metal of the
>fender.
>
>
>
>Paul Vina
>
>
>"Mark F" <mkpl@cox.net> wrote in message
>news:aia720d17qkiq0flutkun661r2eom7649m@4ax.com.. .
>> I replaced the factory radio on my 2004 Honda Accord LX with a
>> Pioneer DEH-5500MP. I used the mounting and wiring kit from
>> Crutchfield, which is a Metra 99-7862. With this setup I no
>> longer get AM reception. The antenna is snug and tight in the
>> socket of the new unit, and FM seems to be fine. The factory
>> unit had no problem with AM, and the AM on the Pioneer unit
>> worked fine in my older car. Could it be a grounding issue? If
>> so, would it just be to connect a wire from the car frame to the
>> Pioneer frame, or would that create a ground loop and other
>> problems?
>>
>> To make manners worse, it appears that once the Metra mount kit
>> is snapped in, it is very hard to remove.
>>
>> Other than that, it works great.
>>
>