No power to Tripac evo APU after changing alternator belt

Belts can break because they wear out, or the device they are driving makes an excessive demand on the belt, which breaks the belt. When a belt breaks it doesn't always leave evidence on the belt WHY it broke. Ideally, the belt that broke was so new you are confident it wasn't the belt breaking because of "old age". If so, it suggests something about the APU driven generator/alternator caused the belt to break and replacing the belt isn't solving that underlying generator/alternator problem. The more electrical power demanded the more difficult it is to turn the generator/alternator, which puts more stress on the belt. Maybe a bearing in the gen/alt is worn out? Maybe there is an electrical fault in the g/a?

 

Few things it could be. Right off the top of my head if you have replaced all the fuses and still no power. Either a cable has corroded and no power is getting to the unit or also likely is one of the fuses inside the box on the board itself has cooked off. Mine was in the box under the bunk. i would open that up and check all the fuses on it and the ones on the board itself. If the fuses are blown check for grounding caused by corrosion or other issues like rubbing wires. If fuses, wires and cables are good and you got no power check to see if your control unit has a fuse in it. I had an older one that did but the newer ones dont. If all the above dont help you may have fried the board and will need thermoking to test it.

As for belt snapping after alt problems then a blown fuse. Then there is a good chance the alt is fried or the pully has siezed. Id check the pully for free play after checking the fuses. Also check the wires on it to make sure non have corroded or come loose. Check both ends as the ground on my old unit rusted off at the frame.

 

There is a reason i threw away my thermocant crypack for a green apu especially after it threw a rod. That said yup if the alt was bad, it very well could have caused a huge short or power surge and cook a motherboard or any number of other things, especially if the regulator went bad. Thats one thing that happened to mine.

As towards the not having power. Again depends on how the alt failed, if its causeing a short then power wont even go as far as your box before it shuts down That said 9 times out of 10 no power means a popped fuse, a bad wire or a fried computer. Usually some combination thereof. Popped fuse usually means a short, a short means a popped fuse and either of those can cook electronics if your unlucky.

 

Sure there is. Open it up and check the fuses. If they are fine and the wires are fine get a voltage checker and start checking the system to determine where power is stopping. If the board has power, no bad fuses and there is no power leaving the board, its fried. If power is leaving the board but the control unit is not lighting up its a diffrent issue.

At this point your best bet is to check ALL the fuses (youtube has guides on this) and all your cables then work your way up the system looking for the short. Its time consuming as hell but not particularly hard. And you can get a cheap checker from more or less anywhere nowadays. I think even walmart carrys multimeters at this point.

I dont have the manuals for your thermoking to know the exact voltages to look for but TK likely can email you that info if you call them. Should be pretty cheap too if they have a repair manual.