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Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 9531
Experience:  worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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I have a thermo apu unit. it has a alt code on it. I took it

Customer Question

i have a thermo king apu unit. it has a alt code on it. I took it to thermo king an the charged me to tell me it was the alternator bad. I purchased a new alt. and installed it and it does the same thing with the same code.
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Customer: replied 1 year ago.
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Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I will help you with this

I have 34+ years at TK

The only thing that pulls up that code is a loose/broken belt

or not charging, use a volt meter and check the voltage at battery

you should see 13.2 volt or more , if not, new alt is N.G

what alternator do you have , Prestolite, or Bosch

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