As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON SHORT FINAL, THE ALTERNATE BATTERY OFF LIGHT ILLUMINATED. THERE WAS ALSO A SMELL OF BURNING PLASTIC. LANDING ACCOMPLISHED WITH NO OTHER PROBLEMS. TROUBLE SHOT ALTERNATE BATTERY SYS & FOUND ALTERNATE BATTERY RELAY BURNED OUT. R & R RELAY PN A-770Q, SN C-54753 IAW SA 4045-80 CHAP 24-97.