Help Testing Dash Component backlighting prior to Re-assembly

[shanemasters1]

I am in the final stages of my lighting install on my 91 q45. I have the dash, gauge cluster, and all other components taken out. I would like to make sure that all of my new lighting works properly before re-assembling the dash. Tonight I connected the hvac controls, turned the car on, turned on the headlights, and turned on the hvac system. with the lights off the screen appeared normal. When I turned the lights on the display disappeared and no backlighting turned on. At the same time I had the clock connected. I have tested the clock backlighting with a 12 volt battery so I know it works on its own. When connected to the wiring harness at the same time as the hvac controls neither of them functioned properly. Could someone who has already gone through the lighting install provide some steps for the install and troubleshooting.

all help is appreciated.

shane

[Q451990]

Please check out our responses in your other thread and discuss this there...

zer...embly