I'm converting the headlight motor control system on my '85 'Vette, with it's 3 external relays and 3 internal switches per motor to use a module from an '87 and up Firebird. I got the module from a salvage yard and after hooking everything up there was no ground output from the module. The + output was switching but no -. I figured the module had to be bad so I went back to the Pick-N-Pull and exchanged it for another one. Got it home and.....same thing
It seems unlikely to get 2 in a row with the same problem but everything else seems to be good. The input ground is good at the harness pin. I can't think of what I'm missing.
Does anyone have a manual with a diagnostic procedure for the module? Is it possible to check/test one with a DVOM?
Thanks in advance for any help.