Skyhawk 172/Cutlass 172
Flight Crew Private
Flight Crew Last 90 Days 15; Flight Crew Total 110; Flight Crew Type 100
Troubleshooting
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Aircraft Damaged; Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed; General Evacuated
Aircraft
This incident occurred while departing for a lesson towards my instrument rating; myself left seat and Flight Instructor in the right. After engine start; I taxied to the area commonly used for run-up; non-movement area of the ramp. After calling for clearance; I noticed a low voltage annunciation on the main bus; and [a] reading of 16V. I scanned the switches and confirmed that main battery and alternator switches were on; and no circuit breakers were in the tripped position. A few seconds later; both my Flight Instructor and I started smelling something acrid; and I started shutting down the airplane following the electrical fire checklist. After evacuating; the smell was still present but did not seem to be getting worse. As we were still close to parking; we manually pulled the airplane back and referred the issue to Maintenance to investigate further.
C172 student pilot reported a low voltage annunciation while performing engine run-up with an acrid odor present and along with the flight instructor.  They elected to shut down the aircraft and evacuate to investigate further.