I am new to google and generators so please bear with me.

I borrowed a 20+ year old Honda generator and successfully used it at
a remote camp when all of a sudden the motor continued to run but
power to the shop vac stopped. I let it sit for awhile and while the
engine workled fine no power was available for the shop vac or any
other small electrical appliance.

I found the owners manual for the unit online and looked for trouble
shooting tips but nothing jumps out at me. I am not a mechanical
person and tried to bring it to a few local small engine repair shops
and while only 1 would look at it, they won't have time for 3-4 weeks
and am wondering if there are some simple tests I can do to in the
meantime. any help is appreciated.