Thermoking Evolution USB Connection

Code 61? The description says your voltage is either too high or too low. Isn't that informative!

You need to download the R2 or R5 software and see what the sense voltage is. If it isn't the same as or close to the system voltage, and the system voltage shows the alternator clearly charging, then you have a broken sense wire. I screwed around with mine for a solid week before I finally gave up and took it to Thermo King. They ran a bypass on the mother board so it doesn't need to read the sense wire. Now it starts and runs fine.

Also, just as an FYI. Those two wires that come together at the negative terminal on the voltage regulator are the load control circuit. That is what makes your alternator switch off when the AC compressor is running. It also limits the alternator output under certain load conditions. It's a California emissions requirement that you can bypass if you have the heavy duty alternator. There are two different versions of the 120 amp alternator. The heavy duty one is the one with the orange voltage regulator. It's part number 452947. If you have that one you can disconnect those two load control circuit wires and run a jumper from the alternator ground to the voltage regulator ground. The documentation says not to do that, but oddly the same documentation has a diagram showing that wire in place. A TK dealer told me you can't bypass it on the cheaper alternator because it will burn out the voltage regulator, but you can do it on the 452947. I did the bypass about six months ago and it has been working fine. Use at lease a 10 gauge wire.

 

Before I bypassed the sense circuit I was getting 14.3 volts to the batteries and I was replacing them about every 18 months. Now I'm getting 13.9 volts, which should be OK.

 

That's an OK charge current right after it starts. Notice the voltage is only 13.2 volts. That'll climb to around 14 as the batteries recharge, then the charge current will drop, unless you are running accessories that need power.

 

5600 hours on it is good,I've got 12,000 hours on mine.
Mine will shut down when the batteries are reading 14.2 volts.

 

A good alternative to dealer pricing is a company called thermobyproducts . Great customer service and decebt prices. Have everything for an apu . Oem and aftermarket