I paid for an on line service manual for 1988 old's but it does not have a wiring diagram and I'm not getting power to the a/c control panel and I don't know which incoming wire should have power, were to get or what to do?

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blower motor suddenly Quit. all test of motor, resister pack, relay, Fusses etc. are good, jump blower switch and it works on hi. Intermittently with road or door jar it will come on. reading 12volts on only one pin of 2 incoming harness plugs to a/c control panel, all others dead. don't know what they should read. no visible damage to harness. Googled, could not find IP wiring diagram newer then '92. other service manuals don't seem to have IP wire harness diagrams either.