CarFusebox

C100 Bulkhead Connector As for the bulkhead connector. GM uses a dielectric type of grease on many of their connections to help reduce the corrosion factor. This grease should be considered normal.   Nearly all of the bulkhead connectors on GM vehicles are sandwiched between the firewall using a single bolt through the center. This bolt may not come out all of the way, as there may be a retainer on the threaded end of the center bolt to hold it within the connector. As you begin to remove the center bolt, you may need to gently pry the connector away from the sealer that was used 15 years ago during the assembly process. Check to see if you are able to lower the fuse box from inside first to help get a good view of the way the connector is secured.   I am also seeing a bolt that is shown to be in the lower corner on this graphic. Let me know if this pic is accurate and matches your vehicle. Bulkhead connector location diagram:

Chevy Alternators have been burning up Check the Wiring Connectors From Alternator See below more details: On the alternator there is connector with two wires, brown and pink. From the schematic, these are supposed to go to the generator indicator light and gauge. These are both shorting to ground.The schematic shows these going to a C100 and then C200 connector See Below the schematic for the 94 Blazer with 4.3 L VIN W as the 8th digit of your vehicle Identification number.     The C100 connector is the bulkhead connector, and there is a fuse panel directly behind it.   One of the Pink/Black wires shows to go to the 20 amp IGN/GAU fuse. Therefore, you should see 12 volts on that circuit 39 Pink/Black wire at the Alternator.   I see why there is some confusion, as there seems to be 2 Pink/Black wires at the alternator terminal C by the schematic...with the Brown wire leading to terminal B.   The Brown wire from the alternator...