Posted by JDEM on May 05, 2016 at 19:55:19 from (70.194.3.23):
This seems like it should be easy, but perhaps not. I've been trying to find a push-button starter-switch for my little Oliver OC-3 crawler. Has a little Hercules IXB3 engine. This still has the original 6 volt electrical system. In the winter, I often disconnect the charging system and put in a 12 volt battery so it will start. It is too sluggish on 6 volts in cold weather and just barely adequate in warm weather.
Here is my confusion. I found out after some voltage-drop testing that most of the problem is loss in the push-button starter switch. I bought a new one and have the SAME problem. Now -after some research - seems every push-button switch I can find is only rated at 100 amps and that is ridiculous. It will work when hooked with 12 volts but not HD enough for 6 volts that needs twice the amperage. Not even close. My 6 volt Delco starter is rated for 60 amps no-load and 500 amps fully loaded. Probably should draw around 200-250 amps during normal cranking @ 4.5 to 5 volts. Yet - I cannot find a push-button switch anywhere rated more then 100 amps. Is nobody making them anymore? 100 amp rated switches sold for a 6 volt system are a rip-off, in my opinion. If that is all there is - no wonder so many convert to 8 or 12 volt systems. If anyone knows where a true HD 6 volt switch is available, please post the info. Even with electric-solenoids for 6 volt systems - so far I'm only finding ones rated for 200 amps max, but at least that's better then the mechanical push-button at 100 amps.
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