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This is the 4-pin diagnostic connector on the ECM555 / PCM 555harness
We can no longer purchase the original GM parts
ECM555 0718
We have made our own version of it and it is ready for sale
Below are some photos for comparison
CAT Y Cable to CAT 14 and J1939 9-pin This is the 4-pin diagnosticY cable for mew style 14 pin CAT systems. This cable includes one Female (sockets) connector to plug into your vehicle connected to two Male (pins) jamnut connectors. This allows you to plug two accessories into one vehicle bulkhead connector. All 14 contacts are Y'ed through to the two vehicle side connectors:
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