Stanley, voltage has nothing to do with it..... a diode prevents
reverse current flow.... try it with a meter...... or check this out....
http://www.allaboutcircuits.com/vol_3/chpt_3/1.html
3 amps on a fridge might not be enough though, Radio Shack has a 6
amp rectifier (big diode) which should handle a small fridge.
If Bob is using positive ground, like the others have said, be
careful not to short anything out. A cheap cooler is likely to be
mainly plastic.
If your afraid of damaging the car wiring, skip the sockets and run 2
wires directly from the battery and fuse it.
I wouldn't run a T series without adding a fuses so the entire system
is protected. There are a couple of simple places to do it.
Mike
On Jun 18, 2008, at 2:43 PM, Stanley Brohn wrote:
> Hi all,
>>> You need 1N5401 rectifier diode 3A 100V (radio shack or any local >
> electronics parts store if you have one) It will go in like an >
> inline fuse
> but with polarity.> > One end has a line on it and it will go to
> the negative
> side. So on > positive ground car, the line side will go to the
> power negative
>> (dash) side. (reverse it for negative ground)
>>
>
> Good explanation
>>
>> Put a 3 amp inline fuse with it. You might consider putting the
>> fuse > and
> the rectifier behind the dash.>
>
> I'm not sure that will give you what you want. The full voltage
> (-0.7 V from
> it) will still be at the terminals if you put the diode behing the
> dash. I
> think you would have to put the diode on what ever you plug into
> the dash.
>>
> Sometime to be sure they will have a diode across the input to the
> device so
> that if it is plugged or connected wrong it will blow the fuse.
>
> Stanley
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