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Hi, my name is ***** ***** I will be happy to assist with this today.In some cases, I may need more info to assist better.I apologize for any delay.
The circuit 30 power supply only being 7.5 volts will cause all of these issues here.It should be the same voltage as the battery which is around 12 volts.I recommend having all fuses checked in all fuse panels for any blown fuses that may be causing low voltage.If all fuses are o.k. then wiring needs checked leading from each fuse panel to see if any wiring is found to be faulty or damaged needing repaired or replaced.Low voltage causes all kinds of electrical faults intermittently.If the voltage issue is intermittent with the electrical faults here this may be due to a loose or corroded battery cable needing cleaned and tightened at or leading from the battery, the battery itself with an internal shorted or dead cell causing intermittent low voltage or the alternator itself at fault needing replaced.
These all need to be checked into to then locate and repair this issue here.
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