1991 Toyota Corrolla electrical problem

[quote:9d76aa10b7="shucker"]1991 Toyota Corrolla, 1.6 engine, 180,000 miles, air, auto.

The "brake" and "batt" lights illuminate intermittantly together, dim and bright. Sometimes they flash on and off. Car starts great, had the alternator checked on a machine at my local parts dealer, checked good. Battery voltage checks good and is being charged with engine running. Running down the road, the lights come on and off. Everything appears to be working ok. Both of these lights come on at the same time, when driving down the road.[/quote:9d76aa10b7]

Battery voltage checks good and is being charged with engine running. What's the voltage reading?

[quote:7e967baff7="rasmataz"][quote:7e967baff7="shucker"]1991 Toyota Corrolla, 1.6 engine, 180,000 miles, air, auto.

The "brake" and "batt" lights illuminate intermittantly together, dim and bright. Sometimes they flash on and off. Car starts great, had the alternator checked on a machine at my local parts dealer, checked good. Battery voltage checks good and is being charged with engine running. Running down the road, the lights come on and off. Everything appears to be working ok. Both of these lights come on at the same time, when driving down the road.[/quote:7e967baff7]

Battery voltage checks good and is being charged with engine running. What's the voltage reading?[/quote:7e967baff7]

12 volts static, about 13.5 running with alternator.

[quote:eae1ffa47f="shucker"][quote:eae1ffa47f="rasmataz"][quote:eae1ffa47f="shucker"]1991 Toyota Corrolla, 1.6 engine, 180,000 miles, air, auto.

The "brake" and "batt" lights illuminate intermittantly together, dim and bright. Sometimes they flash on and off. Car starts great, had the alternator checked on a machine at my local parts dealer, checked good. Battery voltage checks good and is being charged with engine running. Running down the road, the lights come on and off. Everything appears to be working ok. Both of these lights come on at the same time, when driving down the road.[/quote:eae1ffa47f]

Battery voltage checks good and is being charged with engine running. What's the voltage reading?[/quote:eae1ffa47f]

12 volts static, about 13.5 running with alternator.[/quote:eae1ffa47f]

Charge the battery and get it up to 12.8. When its there load test it-using the starter for 10secs if it drops below 9.6 volts-replace the battery no good-

Belt tension good?