1992 toyota corola lights dim in idle

Check the output voltage of the replacement alternator, especially if it is an aftermarket one. Check cable and ground connections.

Slight dimming of lights is normal when idling because alternator does not output so much energy. It should disapear after slight increase of RPM (more than 1000).

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========= I'd check the battery also. Sometimes a "new" battery isn't. If it has been on the shelf more than six months after date of manufacture "sulfation" of the internal plates can begin. Also, sometimes new batteries aren't fully charged. There should be a date code on the side of the battery - "A" for January, etc. A make shift battery load test is how well the starter spins the engine. You can also use a voltmeter to measure voltage across the terminals after the engine has been off for several hours, and also while running and running with electrical load. You can also use a hydrometer to check the individual cells to see if one or more are weak or not fully charged.

So in other words, batteries are like milk.

=== Apart from the obvious difference that you don't drink what's in the container, and that after six months unrefrigerated it is still ok.

Sorta - but you can't pour battery acid on your corn flakes.

Car batteries go bad just on time if nothing else. If you bought a battery with a 60-month warranty and it's 60 months old, better get it load-tested and think about changing it. Because it's thinking about going bad - at the worst possible moment...

Milk goes bad quicker if it isn't refrigerated, batteries go bad if you try to deep-cycle a regular starting battery, or you overcharge or undercharge (bad alternator or voltage regulator), or you subject it to wild temperature extremes regularly.

If it's sub-zero weather, better have the battery fully charged or the acid gets weak, it'll freeze and crack the case.

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For $5 and 15 minutes of your time Sears (or someplace like that) will test it for you.

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like that) will test it for you. I purchased the 200$ optima battery from auto zone and bought a meeter when the engin is off it say 13.88 when the engin is on with lights running it says 15.00 so i guess its ok. thanx too all off you for your help.

That sounds good. The alternator doesn't put out it's full power output at curb idle, an 80-Amp rated alternator might only put out 25 Amps if the engine is only turning 600 to 800 RPM.

The ignition, headlights, taillights, brake lights, heater fan and radiator fan can easily draw more than 25 Amps. So if you are stopped with the headlights and the heater fan on, you are running partially off the battery and the system can drop into the 13V or even the 12V range safely. As long as it picks back up to the 13.8 to 14.5 Volt range when you start moving, it's fine.

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