x2. You might simply be blowing fuses because you're putting too small of a fuse in there. What size fuses have you been blowing? Fuse protects wiring from burning up. Period. It has no other purpose. If you're putting 10 and 15 amp fuses in there, and the motor draws 20 amps, that's why it's blowing.
I'm also not a 69 guy...but the 30 amp circuit breaker in our 68's is a heckuva good clue. The fact that you put a smaller 20 amp breaker into your 69 and it solved the problem, tells me your motor might be fine and you simply may have been running fuses of that size and they were probably too small. If memory serves, my 68 is fed by either 8 gauge or 10 gauge wire...I'm thinking 10 gauge. Conservatively speaking, and based on memory alone, that should probably be protected by a 30 amp breaker, or a 25 amp fuse.
So the million dollar questions are: What gauge is your wire, and what amp fuses was it blowing?
Also, have you by chance noticed the last topic on the FAQ page for convertibles? Doesn't say much, but gives a couple more clues. https://firstgenfirebird.org/FAQ/conv/
Most important thing to recognize is that it seems your 69 is a completely different fuse setup than those of us with 67/68 circuit breaker models. So you're kinda at the mercy of other 69 convertible owners and schematics exclusively in order to get the help you're looking for. To avoid confusion I suggest you ignore all 67/68 owners such as me...LOL...our cars are COMPLETELY different in this respect...
