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Re: [GMCnet] Finding your GMC with Google Earth Street view [message #88116 is a reply to message #88104] Fri, 11 June 2010 18:59 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma:
Senior Member

On Jun 11, 2010, at 4:46 PM, Ken Coit wrote:

> Are you guys watching the lack of progress at 4312 Union, 27609?
>
> The good news is that the engine still turns. I discovered that the radio
> works if I turn on the lights! Go figure!
>


Ken
Check the wire that grounds the radio. You might have it connected to the wire that comes from the headlight switch to the instrument lights.

I first posted this back in 2002 and it has solved more than one person's problems with the radio and/or their panel lights.

> For anyone putting in a new radio, bear in mind that the GMC original radios used a separate wire for the panel light in the radio so that it could be dimmed when one wanted to dim the dash lights. Not all newer radios use this feature.
>
> There is a grey wire that connected to the original radio for the panel light. If one were to test this wire with the dash lights off, it would appear to be a ground wire as it would ground through several instrument panel light filaments to ground. If this wire is used to connect to the radio ground wire it turns out that the radio will work just fine as the resistance of several bulb filaments in parallel will not put much resistance in the circuit.
>
> The problem is that when the lights are turned on, the current through the dash light fuse is immediately shorted to ground through the radio and will burn out and the dash lights will not work. If anyone is planning to install a new radio you may want to keep this in mind.

Emery Stora
77 Kingsley
Santa Fe, NM


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