OK, I give up. What model year Mustang are we dealing with?
In general when the dash gauges "sweep" on initial key on, it means that power was removed from the dash. The dash has several power sources and grounds. I would start by checking the cluster power to the power pins and grounds to the ground pins. Remember there are more than one. As for power, start first by looking at the always on keep alive power pin.
Having a set of wiring diagrams would help avoid guessing. If interested in getting a set for yourself I maybe able to help. PM if interested (will need to know the MY).
In general when the dash gauges "sweep" on initial key on, it means that power was removed from the dash. The dash has several power sources and grounds. I would start by checking the cluster power to the power pins and grounds to the ground pins. Remember there are more than one. As for power, start first by looking at the always on keep alive power pin.
Having a set of wiring diagrams would help avoid guessing. If interested in getting a set for yourself I maybe able to help. PM if interested (will need to know the MY).
