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snap on MT2500 scanner help

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Old Jan 7, 2022 | 03:05 PM
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Default snap on MT2500 scanner help

Hello, new 1982 c3 owner here. Just bought a snap on mt2500 for my car, connected it up, and its stuck on the "connect gm-1 to 12 pin aldl" message. I do have the power connector hooked up to the adapter as well. A test light on the CEL connector pin (ckt 419) turns on, and a jump from the A-B diagnostic ports results in some clicking from around the car. The CEL light itself doesnt work but thats a whole different thread. Could someone please help me with this?
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Old Jan 7, 2022 | 06:33 PM
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Check the continuity between the ALDL and ECM. Numbers 451,461,450 are the only ones needed to read data.

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Old Jan 7, 2022 | 07:26 PM
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fixed it. turns out power from cig lighter is not enough. took power directly from battery instead.
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