Brake pad wear indicator light troubles

[skiier3_9]

In my 94 w124 e320 I removed, cleaned, and painted all of my calipers last week. After re-installation the brake pad wear indicator light is on. Last night I attempted to trouble shoot the problem by unplugging all the sensors at the connection on the caliper. To my dismay the light did not go away with all of the sensors disconnected. I found the cause of the light to be the connector that bolts to the (front only) calipers. Without the connectors bolted into place the light is off. As soon as the connector is secured (ie. touching the caliper) the light comes on. Upon further examination it appears that when the connector touches the caliper the light comes on. Can someone tell me how this circuit is suppose to function? Is there suppose to be an insulation washer between the connector and the caliper? It only seems to be affecting the front calipers at the moment.

TIA