I just got done rebuilding my hydraulic tilt/trim motor too.
Although mine was not an electrical problem. It's a 2000 Honda BF130.
A blown o-ring was my culprit. It was a pain in the ass to fix, but I have more time than money.
First I had to remove the motor from the transom. In the process, I did some damage to the gelcoat and fiberglass on my transom. Next was to remove the hydraulic motor from the engine mounting bracket. To do this, you must disassemble the transom bracket. In the process, I damaged my throttle cable. Next step was to remove the electric motor from the hydraulic motor. Surprisingly, I only managed to snap 4 of the bolts holding that part down (truth: there are only 4 bolts to snap).
After the disassembly, I needed to take apart the hydraulic motor. To do this I needed a special pin wrench. After receiving the overpriced pin wrench, things went smoothly. I had the motor apart, cleaned and reassembled in about 3-4 hours. It was a messy process, but not difficult. I found one blown o-ring, but replaced them all. About 16 total.
I have never done this type of work before, so I was pretty nervous when I went to test it.
Initially, the motor struggled to compress all three pistons and I had to kinda coax it along. But once all three pistons compressed fully and purged what little air was in the system, it worked like a champ!
The repairs to the transom and the replacement of my shift and throttle cables went smoothly and I am back in business.
I should have guessed, but after replacing the 16 year old throttle cable, it was clear the old cable was way over due to be replaced. The shifting and throttle are smooth as butter now.
Hopefully I can get another 16 years of use out of her now
If anyone ends up in a similar situation, I have pin wrench you can borrow. It fits the upper hydraulic cylinder for Honda, Yamaha and Evinrude. You can buy cheap pin wrenches at most places, but they are designed for taking the blades off saws and stuff like that. The pins are too small for this application and will not hold up to the torque required to free up the cylinder cap.
Hopefully, none of you shall ever need it, but I will ship it to you if you promise to return it.
Will save you $90.00!