How many reverse polarity fuses do I Need?
I installed a new battery this spring and I keep blowing the two- 40 amp reverse polarity fuses. I’m sure that I have the cable correct to the battery.
Why did my reverse polarity fuse blow on my RV?
RV builders treat 12 volt wiring as “residential service” wiring and use the same color codes. Which happen to be reversed from “normal” 12 volt automotive wiring. They say you learn by your mistakes, in that case I must be a genius. As others have said, a Reverse Polarity fuse should only blow if you hook up the batteries backwards..
Why does reverse polarity cause high peak currents?
With the battery connected in reverse the rectifier in the alternator would have been forward biased, causing a very high current to flow because it is connected directly to the battery. Luckily rectifier diodes can handle very high peak currents, so provided the fuse opened quickly they should have been protected.
What happens when reverse battery polarity is applied?
With reverse applied voltage, a short circuit via diodes or transistors could occur, leading to fatal errors of the electronics of the car. This means, that the ECUs (Electronic Control Unit) have to be protected against reverse battery polarity. 3 Possible Solutions In this chapter three most common reverse battery protection circuits will be
I installed a new battery this spring and I keep blowing the two- 40 amp reverse polarity fuses. I’m sure that I have the cable correct to the battery.
What happens when the polarity of a battery is reversed?
This is the theory: if reverse polarity occurs, the designed diode will then conduct and short the power supply in order to ground and trigger the fuse to blow up. This protects your equipment. This should work well if the equipment has been designed properly.
RV builders treat 12 volt wiring as “residential service” wiring and use the same color codes. Which happen to be reversed from “normal” 12 volt automotive wiring. They say you learn by your mistakes, in that case I must be a genius. As others have said, a Reverse Polarity fuse should only blow if you hook up the batteries backwards..
Why are diodes and fuses in reverse polarity?
It is a bit ironic because most equipment is designed with some form of reverse polarity protection. This is usually in a diode and fuse form. This is the theory: if reverse polarity occurs, the designed diode will then conduct and short the power supply in order to ground and trigger the fuse to blow up. This protects your equipment.