^^ Yes, I have an alarm wired in with a starter kill relay. I have gone through and rewired it so that the wires are going directly into the starter kill relay without any crimps/wire sections in between. Unless the relay itself is preventing from the full 12v going to the starter I suspect that the culprit is old, worn out wiring. The original circuit is feeding the starter solenoid through a huge loop running from the fuse box, around the front of the car through the ignition switch and back to the starter. I am not an electrician so I do not know if wiring "wares out" over time, but by putting a relay and running the starter directly from the battery I bypass any problems with voltage/amps/resistance inconsistencies in the ignition wiring loop as the relay needs very little to be activated, much less than the starter solenoid...
Sorry for the lengthily response -
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