Slides won't slide on 2005 Allegro

I had the same thing happen on our Allegro Bus. On ours, there are 3 solenoids in the right rear compartment above the inverter. When the slide out rocker switch is pushed it supposedly connects the middle solenoid to the third one, and that powers the slides.

The middle solenoid wasn't connecting power to the third, so I took one end of the cable wire on the middle solenoid and connected it directly to the 3rd one. The slides worked fine after doing that, but eventually I bought a new solenoid and connected it as original.

I don't know which Tiffin you have, but yours might have a similar set up.

I'm sure you know this, but make sure your transmission is in park, parking brake is on, key in ignition and in running.
I had an issue with 1 slide and found it was the breaker on the control panel went bad, fortunately after contacting Tiffin, they pointed out the panel I had was for 4 slides, mine only has 3, so I was able to just swap to the empty breaker.

well start at the battery,, then the fuse. then power at the switch and power at the motor.

Not knowing exactly how your slides work, I assume that since they are electric, there is a motor attached to the running gears via mechanical linkage tubes. That's how mine works. And every so often, it will shear the bolts that connect the linkages to the motor, requiring me to replace them. If that's your case, then be sure to replace with Grade 8 bolts and not just your everyday hardware store bolts.

The "shear" factor is by design to help protect the slide mechanism in case it gets bound up. But, after sliding and rotating and working and traveling down the road, the bolts also tend to loosen a little allowing some play and eventually the force of activating the slide will shear them off.

A Grade 8 Bolt will have these markings on the head:

Thanks for the response. Our slides are electric.

Do your jacks work as often they use the same pump as the slides. Try pushing the switch several times... 10 to see if you can get the solenoid to engage. Usually the pump and solenoid valves are under the steps and there are several fuses there. They are bad about not working because of water/corrosion getting to them. Check the one for the pump motor.