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PACCAR products typically have the relays in the primary fuse panel, which tends to be located on the kick panel on the driver's side. Look behind the clutch pedal, and there should be a panel which you can remove to access it. Not sure if they changed anything for that model year, as all the 379s I've worked on were 1994 or older.
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Earn +20 ptsQ: Where is the Main Acc Relay located in a Peterbilt 379 1998?
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