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If, by ECU you mean "Engine Control Unit", I don't believe a 1968 dodge pickup had one.
Were is the ecm located on a 2001 dakota
It is located behind the radio.
ECU fuse
Right behind the headlight on the passenger side.
It is located on the driver side fender right behind the battery.
Behind the glove compartment.
ECU is almost always on firewall and literally just plugs into harness. the trick is you need a replacement from same vehicle year range with same options (eng/trans/ac etc) or will need programming
It is located on the driver side front fender behind the battery.
2.4L? it is located next to power distrubution center by the air filter to 40 pin plugs, make sure key is off when connecting or disconnecting the connectors(they have a lock on them)
Passenger side of the firewall.Passenger side of the firewall.