Hello all, first time poster here, i have a 1991 s10 blazer tahoe 4.3 liter with some new electrical problems. Went to drive it one evening and it was dead. The next morning when i went to jump it there was a huge rats nest in my engine compartment along with some chewed wires..... none that i found had been chewed all the way through. I covered the exposed wires and jumped it but ever since then she has been struggling to start, usually only with a jump. I tested my battery and it was only pulling about 10v. Bought a new battery... now it is performing even worse!!! Replaced my battery cable ends and bought a multimeter. Still nothing. When the car is off my battery, starter and alternator all read right atound 12.3 volts, when the ignition is in the on position it drops to about 1/2 volt. Any insight?