Can I raise my Hilo if I plugged into electric but don't install the battery.

Nope! The Amp output of shore power through the Converter is no where near the amount needed to raise the top. The lift motor needs the high Amp output of a working battery to raise the top.

- Jack

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Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH, Progressive Dynamics Converter, Fan-Tastic Fan, LiFePO4 battery 12V DC Electrical System
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew

Thanks Jack. I was hoping. Waiting for our son to put the new battery in.

If you can get to the battery cables, you can connect a good battery to them using jumper cables (maybe from your tow vehicle). It should go up this way. Some members have attached heavy cable extensions to their battery to make this approach easier. If you do this, make sure you insulate the ends of those cables to prevent them from touching anything or each other in a way that would create a short.

- Jack