setting the base timing on 94 gmc k1500 with 305

where is the connector to place the truck in base timing mode? I have checked the passenger side floor board and can't find it.
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In article

Look under the plastic cover on the passenger side of the firewall in the engine compartment.
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fibermaster321 wrote:

It's a tan wire w/black stripe, located under the glove box, near the heater blower motor. "ONE" wire connector.
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