Lights pulsating - 1995 Mercury Villager

high speed and heavy braking will produce a pulsation in the pedal
that is the abs working properly and the pulsations are the brake release and reapplying
intermittent abs light indicates a wire or wheel sensor problem at one of the wheels

Sounds to be a bad ground wire feeding these light sources.

when u change alternator u should change battery to.

The ABS System setting a Trouble Code, is no different
than any other MIL Lamp or check light,you should be
have it checked for codes,diagnosed and repaired
with a couple of days.

At injector's, need to check if you have ground pulsation, to check, connect test light on pos (+) battery terminal, now your set to check ground, at injector harness, probe wire's, while some one cranks engine, look for pulsation, if you don't have pulsation, it will need a computer, injector pulsation is control by the computer, if no pulsation, then no fuel can get into cylinder.

brake pulsation is caused by warped brake rotors, not sure the ABS light and the pulsation are related, The ABS warning light requires a scanner to be connected and to read the fault code that is stored when the ABS warning light is turned on.

1. Check the fuses
2. Check the battry terminals, rub clean with sandpaper and tight them firmly

have your alternator check at autozone or advance auto for free!! Sounds like the voltage regulator is bad...hopefully this helps

Check grounds near battery.. you have a short it seems. There are also fuses in engine compartment as well.

Remove the alternator and have it checked. If it checks out ok, replace the voltage regulator.