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You can make your own lugs any size you like by using copper tubing / copper pipe. If smaller gauge I insert a 1/4 inch drive ratchet extension in one end of 1/4 or 3/8ths inch tubing and flatten the
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In your case you got broken wire or corroded plug somewhere (OPEN) high resistance. Take your meter leads and connect them together you should see numbers closer to 0~5ohms, which means low resis
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You sound like a younger guy, so don't feel bad not knowing something, all this time wasted now will pay for itself later. There's a lot to learn we all still learning.
Does anyone have any info about the pins on a 1998.5 OBD port and where the wires go. I.E. Where the chassis and signal ground go. Im trying to diagnose a faulty smarty cable or faulty obd/truck wiring. I have a 2002 ecu and a rebuilt 1998.5 ECU. I purchased a flash file from smarty to flash the 2002 to my 1998.5. IThe smarty would connect to the ECU while it was connected to the 2002 donor truck. IT wont on my truck. It wont connect to the 1998.5 or 2002 ecu while on my truck. I can hook my scan tool up to my truck and it will connect to both and read codes on both? SOOOOO I think something might be wrong with my obd port.