2004 Ford Focus ZX3. Manual Transmission. Alternator replaced 1-2 years ago for different symptoms/issue.
My problem is that the headlights dim or flash (pulse down to very very dim then back to full) when accelerating or decelerating. Pretty much only when in gear.
They will go back to normal when I depress the clutch pedal (usually I think) or am coasting in neutral.
The fan in the car and other electrics/indicators seem to suffer from same power fluctuations too.
AND ALSO POSSIBLY RELATED.
A little while after seeing this, I noticed a faint then more pronounced clicking coming from left side of dash. (Fuse/relay box?) It seemed to click when the “shift” light would pop on and off about 20% of the time the light did. Otherwise mostly when accel/decel.
I started pulling relays and driving around a parking lot to see if it was one. The click seemed to disappear after pulling the horn relay. (And not the “Battery saver” relay next to it. Odd)
The clicking issue does not happen all of the time when driving. The power dimming does.