problem with reefer unit need help

Is it putting out 12.6 by display or multi-meter? Both computers give a 12.6 read? If the alt is putting out 13.6 but is only receiving 12.6 to the computer it seems as there is an overdraw coming from the computer or for some reason the alt and comp aren't "talking" to each other properly. Maybe a belt slipping the shop didn't catch?

 

Try putting on your spare ALT. too see if that changes reading on it?

 

Not running 12.6 volts would be normal. Running you should have at least 13.5V or the alternator is weak from worn brushes. You need to pull a multimeter or DVOM out and check it manually at the battery would be sufficient.

Still that has nothing to do with it not cycling. It sounds like a bad thermistor or relay. Do you have any fault codes stored? Is it holding box temperature? If it's not reaching temp it will run continuously. That would be that sensor in the top front of the box but that would throw a code.

When it's running on cycle raise the box temp and see if if it will cycle.

How do you stand that noisy thing?

 

something is missing in this scenario if it was at carrier and they gave up

 

If the alternator is putting out good on the bench and then you have a voltage drop installed you have either a short or a bad cell in the battery. Something is drawing it down.

You have me confused with them conflicting statements.

 

Are we to assume the unit has cooled the box and product to the set point and not struggling due to very warm product or a torn chute near the front? Is there at least 10 degrees difference (colder) between the output air and the return air?