A bypass harness is a wiring harness used to bypass the original truck OEM wiring
to the engine ECM. The harness has everything that the engine needs to run. It has a
data link connector used to communicate with the ECM. In addition there is a throttle connector so that you can plug in a throttle and rev up the engine. The large alligator clips make connecting to a power supply fast and easy.
Customer stops by in a hurry and wants you to plug in to see why the check engine lamp is on. However, your service tool cannot communicate because the truck has a damaged wire at the diagnostic connector or ECM.
If you had a bypass harness, you can plug it directly into the engine bypassing the broken wire. Allowing you to read the faults and advise your customer.
You have just finished swapping engines in a truck only to find that the "good engine" you just put in has problems.
If you had a bypass harness, you could have tested the engine first ensuring that the engine is free from defects, i.e.: leaking, missing, smoking, vibrating or faults.
Engine cranks but won’t start.
Connect bypass harness to isolate the engine from the truck. If the engine starts the problem is in the trucks electrical system. If the engine still won’t start the problem is with the engine.
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