Hello, I have a restored 68 with power top. When I had the top shop install the new top, they also replaced the rams, top motor and lines. Prior to body being completed and top installed, I disassembled, cleaned and lubricated all pivot points. Ever since completing the restoration I have been popping the fuse. My top switch also began giving me issues and I replaced it last year along with adding a circuit breaker in place of the fues. At the end of the season (last year), the new switch failed during the top down function. I figured the switch failed for sure but wanted to figure out why and suspected possible excessive heat (too high of an amperage) and finally got a chance to pop the switch out and take a look at it. The switch and even the connector show signs of excessive current so I put my lab scope and amp clamp on it an captured several waveforms (which look fine) but amperage was consistently at approximately 25 amps, with an initial peak at approximately 30 amps.
I am wondering whether anyone out there has, or could possibly, perform a current draw test on there motor and let me know what they come up with. I have taught and written material on current ramping of solenoids and motors and experienced enough to know only three factors really affect amperage draw (causing excessive amps)... Voltage supply higher than expected (mine is 12.6v KOEO and 14.7v KOER). The other factors are shorted motor windings (lower than normal resistance), or excessive mechanical resistance. Excessive mechanical resistance could be due to linkage binding or slower than expected motor armature speed (maybe someone can time there Top Up, Top Down speed beside performing an amp draw test).
Anyone who had similar issues or maybe even there own test results would be greatly appreciated. TIA