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Alternator is too hot compared to its normal operating temp

Tiny
ANGELO MABINI
  • MEMBER
  • 1997 TOYOTA TAMARAW
  • 100,000 MILES
For just a several minutes the engine is running at idle speed with all loads on (lights, hazard, etc, no aircon, radio) the alternator is so hot that if to touch, my hand cannot sustain for about two (2) seconds. What could be the problem. I already fixed the loose wires thinking that it is the cause however, the problem exists. Can you please help me on this one? Thank you so much and more power!
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Thursday, May 2nd, 2013 AT 4:18 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The alternator is failing and working too hard. Replace the alternator/

Roy
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Thursday, May 2nd, 2013 AT 4:23 PM
Tiny
ANGELO MABINI
  • MEMBER
  • 3 POSTS
Thank you Roy for the immediate reply! I forget to tell you on my first post that I had just replaced the alt. Although it is not a new one because of the year model of my car, I find it hard to look for a same alternator especially with my location. So, I bought a surplus alternator previously installed in a Toyota Lucida? I made some minor modifications on the mounting only, but not on the inside of the alternator itself, i.E. Replaced the pulley from the old one to the surplus alt.
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Thursday, May 2nd, 2013 AT 4:45 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Take the old one and have it rebuilt

Roy
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Thursday, May 2nd, 2013 AT 4:49 PM
Tiny
ANGELO MABINI
  • MEMBER
  • 3 POSTS
I figured it out already! During connections, inadvertently I interchanged the I terminal of the alternator and the S terminal. Thank you anyway for the answers Roy!
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Friday, May 3rd, 2013 AT 4:54 AM

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