The Astron RS‑35M is a 13.8 VDC linear power supply rated at 25 A continuous with a 35 A surge capability; it features front‑panel Anderson power poles, dual backlit voltage and current meters, and built‑in fold‑back current limiting and crowbar protection. Common failure modes include blown internal fuses or overload protection tripping, regulator IC degradation causing output sag or ripple, meter drift or failure, and heat‑sink overheat leading to thermal shutdown. First‑check diagnostics: verify 120 VAC input voltage and waveform, measure the regulated DC output with a multimeter while monitoring the meters for consistency, inspect all fuses and the internal regulator area for burn marks or excessive heat, and confirm that the fold‑back current limiting is engaging correctly under load.[oss-gpt-20b]