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I agree with Zeke here, but if you have no ac operation, checking the AC fuse is first, then connecting gauges is next .
When you do connect to the service ports, only turn the knobs down far enough that you have opened the schrader valves . I usually watch the gauges and as soon as the needle moves, I stop turning .
I have damaged a few schrader valves like this, and also, sometimes, just disturbing them causes them to leak .
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No left turn un stoned
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