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## Re: Defroster in BGT

 To: "R. O. Lindsay" Re: Defroster in BGT James Nazarian Jr Wed, 6 Jun 2001 12:58:06 -0600
 ```Yea, I forgot about that. I had the formula for watts to amps in my head, but I forgot that if I took the resistance of the defroster I could get my power needs that way. BTW, does that work for horns too? Is it as simple as finding the resistance of the horn? -- James Nazarian Jr 71 MGB roadster 71 MGBGT-V8 in need of paint 01 Impreza 2.5RS A complex system that does not work is invariably found to have evolved from a simpler system that worked just fine. On Wed, Jun 06, 2001 at 11:52:54AM -0500, R. O. Lindsay profoundly declared: > > > James Nazarian Jr wrote: > > > Listers, > > > > Can anyone tell me how much power (in amps or watts) the defroster on the >GT draws? I am building the harness for my V8 and would like to put the >proper fuse on this component. If anyone can measure one that works I'd >appreciate it. > > Paul, check me on this but if you have a multi-meter you should > be able to work it out. > > I = E/R > > where, > > I is current in Amps, the units fuses are rated in > E is voltage. 12 Volts in this case. > R is resistance in Ohms. This is what you can read on your meter. > > Measure the resistance of the defroster coils. This should be a > rather small number so good, tight connections between the meter > leads and the defroster connectors is paramount. > Should you read 3 ohms, the current is 4 Amps. This does not > mean that you should fuse it at 4 Amps as that is the operating level, > hypothetically. Paul can give you better advice about the best fusing > level. I would use 50% over the operating level IF the wiring will > support that current load. I suspect that the current will be noticeable > higher so the resistance will be smaller. Being in the denominator > of the equation, the measurement error becomes enormous. > Paul, comment? > > Theory is theory but 'noise' is not included. Being a big fan of > empirical data, I would rather hook it up to a 12 volt battery through > a high current ammeter and measure the load directly -- then fuse > accordingly. > > -- > Rick Lindsay > Diamond Geoscience Research > 5727 S. Lewis Ave., Tulsa, OK > Voice: +1 918-747-3456 > Fax: +1 918-747-8599 /// /// mgs@autox.team.net mailing list /// (If they are dupes, this trailer may also catch them.) ```
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