Electronics > Beginners
Regulator internal configuration
larrybl:
Working on a Garden Tractor charging system. I am indoors and can only try and run the engine with the doors open. Weather is preventing this right now. When I did get to start this it would only run for a few seconds before shutting down. I noted no + movement on the AMP meter when it did briefly run. I suspect the fuel solenoid not getting power from the regulator. I have several other machines that just use a single in-line diode for battery charging, prompting me to speculate on what the internal configuration of this regulator may be. It is a three terminal unit. The two outside terminals are connected to 28VAC stator, the center terminal Is B+ and the case is ground. I am thinking it may house a bridge rectifier in this configuration. Is there any way to confirm this without de-potting?
PS, I have checked the wire for connectivity back to the battery and it is good, and I have a new regulator on order.
amyk:
It would include at least a bridge rectifier, and likely a linear regulator too.
mikerj:
Typically regulators for small engines with permanent magnet alternators use SCRs to shunt the stator output when voltage rises above regulated output. If the reg is bad you will likely be able to use something from a small motorcycle engine, though beware as some of these are designed for a grounded charging stator (half wave rectification) rather than a fully isolated one.
larrybl:
Ran into another issue preventing starting the machine. I measured the stator and it is floating (no continuity to ground) I have a 28vac 2A transformer that I should be able to use to check the regulator while I fix the other issue.
larrybl:
I confirmed the regulator is good, Need to look into this further. https://www.youtube.com/watch?v=XZeqJg_Ydoo&feature=youtu.be
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