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Question:

Why do my headlights & dash panel lights blink?

They don‘t completely go out, but dim for a second then get bright again. Happens about once every 90seconds. Checked alternator - tested good one store bad at another. Can‘t see any obvious bad connects , contacts or grounds. ‘98 Ford Taurus. Suggestions?

Answer:

The alternator can be easily checked with a simple volt meter - the battery should read 13.8-14.2 volts with engine running at 1200-1500 RPM's. It sounds like you may have a short in the lighting circuit.
loose belt most likely or bad belt might be dirty cables but not as likely as belt being bad id go to auto zone or any shop just ask them to check charging system again or just say my lights are blinking i think my belt is loose or bad
1 bad battery [not holding voltage 2 bad connections 3 bad alternator

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