Re: how to hot wire to test compression 150 hp force
Much less sparking if you attach the battery cables, positive to solenoid and negative to the block. Then, use a screwdriver to jump from the positive battery cable on the solenoid to the yellow or positive start wire on the solenoid. (Don't remember if the 150 uses different colored start wires)
You are then only using that smaller amount of current to close the solenoid. It will still spark, but not nearly as much.
Careful, if there is any fuel present and if the plugs are not removed, the engine will start and run with the wiring cable to the dash removed.
Be certain to ground all plugs/wires if they are removed to prevent any possible damage to the CD boxes.