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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 3 Days Ago
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Default Generator/regulator circuit breaker

Just had to replace my regulator in my 74. Pretty sure I ran it without polarizing. I got it with a cycle electric 65A and it had a different brand bolt on regulator. I mistook it for a gen/reg combo from cycle electric and read that you didn’t have to polarize every time. Live and learn...anyway bought a cycle electric C-540 and installing now. The other thing I am correcting is I’m going to run it through a breaker. Previously it was straight to the battery. Which brings me to my quick question. It feels like I should run the wire from the gen/reg to the BAT side of the breaker then out of the breaker to the battery, since that’s how the electricity flows. Is this correct?


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Quote:
Originally Posted by Adam13 View Post
I’m going to run it through a breaker. Previously it was straight to the battery. Which brings me to my quick question. It feels like I should run the wire from the gen/reg to the BAT side of the breaker then out of the breaker to the battery, since that’s how the electricity flows. Is this correct?
The stock location for connecting the charging system is the output side of the Main Circuit Breaker (or fuse) - NOT THE BATTERY SIDE...

The main circuit breaker or fuse (as HD wires it) will keep the battery safe from a short in the bike wiring or a short in the charging system - Without that Main Fuse, as wired, a dead short in the bike wiring or a dead short in the charging system will cause the battery to go to maximum current & possibly explode - Bad news for your butt ! ! !

The Main Fuse does not protect the charging system from a short in the bike wiring...

This is the reason you SHOULD ALWAYS have additional circuit-specific circuit breakers (or fuses) to protect the bike wiring in case of a short which will also protect the charging system from a short...

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Thank you my friend. I’m glad I asked. In this instance the bike is pretty well chopped and when I got it, it had no circuit protection at all so I bought a set of 3 breakers, sized same as stock for 74. Basically I’ve got one for lights, one for ignition, and the charging system is now going through the third all by itself. I put a starter on it (XLCH) and ran it through a fuse just for sake of simplicity.


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