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  #1  
Old 11-14-2012, 09:20 AM
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Default wiring a ground question

Read where Greywolf used a grounding lug attached the the cowling frame up front under the fairing, I have a question I will be installing a 12 v power outlet by the dash can I just run a #12 wire back to the battery or the fuse panel and the ground wire to the grounding lug,

2nd question can I get by with a 5 amp switch to turn off a headlight, I can wire a relay if it is needed

3rd question, can I use the heated grip wire under the tank to power my volt meter

Chet
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  #2  
Old 11-14-2012, 10:27 AM
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Sure to all three.
Best bet is to take the ground to the battery. Then you don't worry about poor connections.
The 5 amp switch is good if you are operating the coil of the relay and not the contacts.
The heated grip is that good source to switch the relay. Then it's a keyed device and will not remain on when the bike is shut down.
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Old 11-14-2012, 10:39 AM
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Quote:
Originally Posted by chetc View Post
can I get by with a 5 amp switch to turn off a headlight, I can wire a relay if it is needed
That's exactly what I'm doing, Chet. The relay allows me to use a 5A switch; without the relay, I'd need a switch with a higher amperage rating.
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Old 11-14-2012, 12:14 PM
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Glad I checked in, I meant to use the 5 amp switch to shut off one headlight without a relay, so I need to get a relay and a socket.


thanks
Chet
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Old 11-14-2012, 01:16 PM
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A 5A switch can handle a headlight with no relay. Headlight relays are a good idea though because the stock wiring can develop problems with the headlight load over time.
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Old 11-14-2012, 05:12 PM
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Watts = volts x amperes
Amperes = watts ÷ volts

So, a 60 watt headlight bulb on a 12 volt circuit draws 5 amps.


Watt is the unit of electrical power
Volt is the unit of electrical force
Amp is the unit for the rate of flow of the electrons (6.241 × 1018th power per second), named for André-Marie Ampère
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Old 11-14-2012, 05:45 PM
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Quote:
Originally Posted by PTRider View Post
Watts = volts x amperes
Amperes = watts ÷ volts

So, a 60 watt headlight bulb on a 12 volt circuit draws 5 amps.
The voltage is somewhat variable. 13.8 volts is typically used to approximate vehicle voltage when the alternator is running.
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  #8  
Old 11-16-2012, 05:38 PM
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Is the switch 5 amp AC or DC? Sometimes the DC rating is less. Personally I'd want a bigger margin, so I'd look for a 7 to 10 amp switch. And, personally, I'd avoid the relay and use a higher-power switch, unless I was rewiring the entire headlight circuit. I know (from personal experience) that the connectors are barely adequate, and too much current is going through the switches as wired stock. But adding extra connectors and parts just adds more things that can go wrong, and will make it harder to trace if/when they do.
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