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Re: Marker lights vs headlights .....
Sounds like you have a 67-68 switch.
1967-68 =8-Terminal headlight switch
1969-72 =7-terminal headlight switch
1967-68 the front park lights go off when headlights turn on using original style switch, if you want the front park lights to stay on with headlights use the 7 terminal 69-72 headlight switch as they are interchangeable.
Paul Jr @ GMCPauls
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