The American driver secured a best finish of third place last year at Oulton Park in his rookie season.
Morales is delighted to be returning to GB3 with JHR, a race-winning team from last season.
Morales said: “I was looking for a new challenge for the 2023 season and I am super excited about the chance to race with JHR Developments in the GB3 Championship. It’s a good team with strong results, including winning everything in British F4 in 2021 and placing in the top seven in GB3 last year.
“With three good drivers in the team, sharing data and video, we’ll be in a good place. Matthew is ridiculous on his corner entries, Joseph is meticulous, and there’s me – a mixture of both, so we should complement each other.
“I’m feeling good and positive after winning a race and getting podiums in Formula Regional so I’m keen to get back behind the wheel and prepare for the rest of the season. I’d also like to thank Euro Motorsport and 29 Management for their support.”
Team Principal Steven Hunter is looking forward to working with Morales and is anticipating the three drivers working cooperatively over the season.
Hunter said: “We’re delighted that David will be joining us in the GB3 Championship this season, rounding out a strong three-car line-up.
“He comes with experience in the car which is a real benefit, and his driving style compliments both Matthew and Joseph.
“We think that as a trio they should all be able to help each other throughout the year and I’m looking forward to seeing how he progresses.
“David’s personality has already made for some entertaining test days as he is a funny young man and that relaxed attitude but desire to compete will fit in with us well.”
The GB3 season begins on the 8-10 of April at Oulton Park.