Quote:
Originally Posted by bigwheel
Hi JohnnieB what making this difficult is the pathway inside the box. The stand alone cicuits are easy to test with a good circuit schematic and an understanding of what goes inside box must come out. Im usually decent at this kinda thing, but wonder if ive lost my marbles somewhere along the way as this has taken longer than expected. Maybe a reversal of thought like tracing the live 36v conductors out of the box might reveal the issue. What ever is going on is affecting selonoid yellow wire,key switch,and foward and reverse sw. I think i will also verify any voltages across 1&2 and 3&4 on the tow/run switch probing the connectors backside while its plugged in. I believe its ok as it is not used often.
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Unfortunately the 1206xx controllers (1206SX=DCS 1206MX=PDS) are custom made by Curtis for E-Z-GO, so E-Z-GO is Curtis's customer and while Curtis must provide information to E-Z-GO, Curtis isn't legally required to provide any information about what goes on inside the box to anyone E-Z-GO subsequently sells it to. Since E-Z-GO did not manufacturer the controller, they aren't legally bound to provide information about what goes on inside it to the end user. Basically a Catch-22. Fortunately, Curtis didn't completely "Reinvent the wheel" for E-Z-GO when they designed the 1206 line of controllers, or at least I suspect they retained all they could of the 1204/5 series controller and only added/changed what was absolutely necessary.
The armature portion of the high current motor speed control and the ITS circuits are probably very similar to the ones shown in the 1204/5 manual that is available on the Curtis website. What is a mystery, except for a selected few, is how exactly the the KSI circuit is connected inside a 1206MX controller. (The 1206SX used an analog KSI circuit that was external to the controller)
My guess is that J1 Pin-6 is tied to B- and J1 Pin-7 is tied to B+ via a SSR (Solid State Relay) and the Aux, Power portion of the Run/Tow Switch. And the SSR controlling the Solenoid is controlled by a logic circuit. When all the switches mentioned in my previous post are closed, the 1206MX controller is being told to energize the coil of the solenoid. If it doesn't, either the 1206MX controller or the Solenoid is defective.
From a purely troubleshooting stand point, there are only three possibilities:
1. The Controller is not being told to energize the Solenoid. (One or more of the five switch circuits is bad)
2. The Controller is being told to energize the Solenoid and isn't. (Bad Controller)
3. The Solenoid is being told to activate, but isn't. (Bad Solenoid)
Hope this helps.
John
PS - I taught Logical Troubleshooting in the USAF BMET School
