GPS in a Pos ground Healey?

[Keoke]

Ed, A rectifier whether it is a half wave or a full wave bridge will not function on a DC Circuit. Its primary fuction is to convert an AC voltage to a DC one. On DC circuits the same function can be obtained but it requires a DC-to-Dc converter.---FWIW---Keoke

 

[Johnny]

Hey, who needs a radio, use an ipod and enjoy your tunes without changing your car's polarity. As for as telling me where to go, I already have someone who does that for me. What more do you need?
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[AUSMHLY]

I purchased a cigarette lighter adapter kit at Radio Shack today. I wired the center to ground and the outside to power. It works in my positive ground car!

Thinking it's best to spice into a wire which will only give power when the car is turned on.

I was thinking of splicing into one of the ignition key wires on the dash. Which wire should I splice into?(white/red stripe?)

Or maybe splicing into some other wire, some other place?

There is an inline fuse on the cigarette power wire.

Hey Johnny, the nav system I will use, holds music. There's my radio! It has a jack for ear plugs, or I can use that jack to plug a set of external powered speakers. That's another project which I am looking into. Sony makes a line of speakers that may work. They'll plug into the nav, and plug into a cigarette ligher for power. So, maybe, just maybe I can run both the nav and speakers off a cigarette lighter. I need to figure out how much current both will draw.

Anyone, feel free to comment on if this might work.
And which wire I will splice into to power the cigarette ligher, which is my need to know question.

Roger

 

[Randy Forbes]

Solid White wire is hot when the key is switched on; white/red stripe, if I'm not mistaken, is for the starter solenoid to pull in. Solid Green wire is also hot in run and start mode.

 

[Dave Russell]

[ QUOTE ]

Ed, A rectifier whether it is a half wave or a full wave bridge will not function on a DC Circuit. Its primary fuction is to convert an AC voltage to a DC one. On DC circuits the same function can be obtained but it requires a DC-to-Dc converter.---FWIW---Keoke

[/ QUOTE ]
Hi Ed,
You are of course correct. It's quite common to use a full wave bridge circuit to allow a circuit to be insensitive to input polarity. DC to DC converters are only required if the voltage level is ALSO being changed.
D

 

[Keoke]

Sorry D Thats not true. However a votage level change can be accomplished too---Regards---Keoke

 

[Dave Russell]

Keoke,
Why are you so stubborn? A full wave bridge input to a DC polarity sensitive device is a common way to protect the device from wrong connections. The output polarity of the bridge comes out the same polarity regardless of the input DC polarity. The bridge diodes act as steering diodes to make the output come out the same. Trace out the circuit paths for yourself. Where do you get your information anyway?
D

 

[Keoke]

Never heard of em.---Keoke- OH go here and they will tell you about Rectifiers and other good things; Yangz Hou Hong Yang Electronics Limited. OTOH, an simpler check M W Dictionary for Rectifier.

 

[Ed_K]

I just got back from the big island that SHG lives on and see that Keoke once again doesn't believe me when I discuss electronic circuts. Lets agree that I trust your opinion about most things about these cars but you need to learn to trust others opinions about their " field of experience ". I have 29 years experience with electronic circuts and computers ( starting with the kind that used a 400 hertz motor/generator to supply the power ). I know more than a little about rectifiers and what they are used for.

 

[Keoke]

Well ED, I checked the reference to see what you be going on about. I am not familiar with commercial circuits of that type. However, it can provide Reverse Polarity protection when used on a DC Circuit. My initial comment was directed at the terminology used "Rectifier" which is most commonly defined in the technical sense as converting an alternating voltage to a Direct one.---Keoke

OH! I do think the bridge a BIG step up from cigarette lighters mounted in plastic brackets.-- /ubbthreads/images/graemlins/grin.gif

 

[Ed_K]

You are right. It would be a little too much trouble for most situtions. But if someone wanted to use the same GPS or radar detector, in more than one car with one car being a positive ground Healey, then having a four diode rectifier built into the power cord would make the device "plug and play " for any polarity ground of car.
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