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Gary, ASE Certified Technician
Category: Toyota
Satisfied Customers: 1117
Experience:  Senior Technician
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I have a 2006 Toyota Corolla. The battery light came on

Customer Question

I have a 2006 Toyota Corolla. The battery light came on today, it drove fine for a while, then wouldn't start. AAA came out and changed the battery but told me the alternator was also bad (the battery light stayed on). I changed the alternator and the car seems to run fine except now the A.C. doesn't blow cold and the battery light is on, though very dimly lit. Obviously something got screwed up when I changed the alternator but I don't have any idea what that is. Any help?
Submitted: 11 months ago.
Category: Toyota
Expert:  Gary replied 11 months ago.

Hi Mike,

The AAA tech was correct.

Did you fit a new alternator, or 2nd hand?

Did you disconnect the battery prior to replacing the alternator?


Customer: replied 11 months ago.
It was a new alternator. I had disconnected the negative side of the battery, but not the positive side. When we started to install the alternator, there was a spark and we realized we should have disconnected the positive side as well. We disconnected and continued.
Customer: replied 11 months ago.
Also, I had Advance Auto Parts test the new alternator before installing it.
Expert:  Gary replied 11 months ago.

That's unusual you had a spark with the negative disconnected.

This only occured when fitting the new one?

How big was the spark?

Have you checked all the fuses in the engine bay?


Customer: replied 11 months ago.
Sorry, actually I realized the negative connector had creeped back towards the terminal after the spark happened. The spark was small and I thought a minor incident, but probably relevant in hindsight. The spark was small. I haven't checked the fuses.
Expert:  Gary replied 11 months ago.

Ok, makes sense.

Have seen it before many times.

When you are playing with high current power, even more critical that the leads are well isolated.

Now we need the check all the fuses, one or more could be blown, generally the alternator fuse.


Expert:  Gary replied 11 months ago.

Hi Mike,

How did you go with your problem?

I hope my advice has been of assistance to yo.

Kind regards