Make sure there is the correct voltage going to the dist. On yours I think you should have about 8 volts not 12. There should be a resistor wire to cut the voltage down.
Probably lack of die electric grease under the mounting surface of the module. This special grease keeps the module cool & lack of it could cause the module to overheat & burn out.
You should check the pick-up coil, it can short out the modules. I have ran into this problem before and was a the end of my rope. I found a pamphlet at the auto parts store and read through it and came to the conclusion that the pick-up coil was shot, replaced it and never had to put another module in. Probably lack of die electric grease under the mounting surface of the module. This special grease keeps the module cool & lack of it could cause the module to overheat & burn out.
An ignition coil in a Chevy may keep burning out due to several factors, including electrical issues such as a short circuit or faulty wiring, which can cause excessive current draw. Additionally, overheating from prolonged use or poor ventilation can lead to premature failure. Other potential causes include a failing ignition control module or problems with the spark plugs, which can place additional strain on the coil. Regular maintenance and diagnostics can help identify and resolve these underlying issues.
Ignition switches and body control modules are issues on these cars.
The 1991 Blazer has a current draw causing the wire to burn. You will need to trace the wiring out to find what is drawing too much current.
A bad ignition module.
It would have electronic ignition, no points.
Ignition module in the distributor.
test ignition coil,ignition module,pick-up coil,electronic spark control,and knock sensor
I would expect that the power for the fuel pump would be supplied through the ignition switch so I would start there, that is check the ignition switch.
Probably ignition switch. Have it checked out.
I would replace the ignition control module that's in the distributor.
I would suspect a failing ignition control module.