Just checked, the lights are pulsing really fast. I put the headlights on and the pulsing is slower and about every 3 to 4 seconds the pulsing stops and becomes normal for about a second or two and then it comes back again. I put another ground on the battery and never made no difference. I put the meter on when I had the headlights on and the voltage was pulsing around 12.5 volts and when it became normal the voltage was around 14.5 volts
The alternator/voltage regulator was the cause of those symptoms in our 88 coupe. The headlights flashed similar to the way a motorcycle headlight pulses. If I remember correctly, it was putting out something like 15.5 volts.
Originally posted by newfiejeff: I put the meter on when I had the headlights on and the voltage was pulsing around 12.5 volts and when it became normal the voltage was around 14.5 volts.
If the alternator were working correctly, the voltage should remain constant at about 14.5V. Since it's dropping down to 12.5V that means the alternator is cutting in and out and causing the car to run on battery power.
Yep, pulsing lights is a classic symptom of a failing alternator. But just to be thorough, you should also check the battery terminals for looseness or corrosion, and check the ground strap(s) to make sure there's a good connection on both ends. Also check the power distribution block next to the battery, to make sure the connections are tight.
The last time I heard that problem the guy was clipping his power amp.
------------------ "Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut