I have a 1993 Accord DX (160,000 miles), which I have fitted with an
aftermarket stereo (Alpine). The problem is, every time the electrical
load changes, the radio "reboots" (cuts out briefly, then restarts).
Once, the entire car went dead when I stepped on the brake, on a stormy
night, in mid-intersection--yikes!

Occasionally, the stereo will reset itself completely, as if the
battery cable had been disconnected. This means reprogramming station
presets and names, EQ settings, preferences, etc., etc. Grrrr...

Most of the time, the stereo seems to act as a "canary in the coal
mine" for voltage glitches, since the rest of the car appears
unaffected; I do notice the "D" indicator and clock will flicker quite
a bit.

Example loads:
--brakes (most common)
--headlights
--engine cooling fan

Most apparent when:
--Just starting out
--Mild weather
--Stop-and-go traffic
--Exiting Interstate after extended period
--A/C is off (oddly, running the A/C minimizes the problem--SOMETIMES)

My guesses:
(1)    Bad or missing ground, or corroded battery cable
(2)    Weak battery, or intermittent internal short in battery (it's a
cheapo Wal-Mart unit, out of warranty)
(3)    Bad voltage regulator and/or alternator
(4)    Bad ICU (this was a problem in Preludes and Integras of this
vintage, IIRC, and the Accord uses more or less the same unit)
(5)    Bad ELD (expensive!)