Stanley pointed out to me the obvious. A diode has to go on the
adapter side. A diode behind the dash (on the supply side) would
never work.
You could (and should) put a fuse behind the dash on the terminal.
Radio Shack also has a 6 amp diode (4 for 1.89) which should be
plenty big.
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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