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How to troubleshoot charging system 99 pontiac gran prix gt 3.8l the two pin connector does what and goes where ? what voltages woulld you find there. new altenator instaled but heats up stops engine.
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With the Key in the RUN position, check for battery voltage on the brown wire in connector 2 terminal H at the DRL module. Also check for battery voltage on the pink wire terminal C of the same connector. if you see battery voltage, then the IGN switch and the two fuses supplying power to the DRL are working fine.
Next, check the brown wire in connector 1 terminal H at the DRL module for battery voltage
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Pin 20 on the blue pcm connector is the power wire to the pcm it is an orange wire. (hot at all times). The power to the data link connection is the cig fuse in the i/p fuse box.
Release the fuel pressure by loosening the gas cap, raise and support the car on jack stands,squeeze the plastic tabs on the male end of the connector,and pull the connector apart.Some models have 2 tabs,and others have 1 and the fuel line screwed into the other side.Remove filter mounting bolt,unhook tab from frame and remove filter. when you put in the new filter, make sure the arrow is pointing toward front of engine.On the line with plastic tabs, just push on till you hear a click, then pull on it to make sure it's latched.Don't forget to tighten gas cap.
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