Hard wiring a radar detector - LotusTalk - The Lotus Cars Community
 
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post #1 of 9 (permalink) Old 12-15-2017, 02:33 PM Thread Starter
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Hard wiring a radar detector

Searched and didn't find anything.

Who has hard wired a radar detector into their Elise? A fused power cord thru/under the dash for a unit set on the dash.

Looking at the forward fuse box and the aux/20 amp fuse would be a good start but does it take a clamshell off to access any dash thru port?

Any suggestions or experience would be appreciated.
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post #2 of 9 (permalink) Old 12-15-2017, 03:15 PM
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Fuses under dash tray:

Footwell Fuses
Fuse Rating Circuit
C1 20A Interior fan
C2 15A Wiper motor
C3 7.5A Audio key-in
C4 7.5A A.C. compressor

You want a circuit that doesn't remain on when key is removed. You have that here.

BTW, the higher up on the w/s the detector is, the more warning you get.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #3 of 9 (permalink) Old 12-15-2017, 03:20 PM Thread Starter
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Yeah, I saw those but don't know if I want to slave off of those functions....I am not an electrical guru and electricity is like magic...altho I wire things all of the time I try to do it with a large margin in amps....
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post #4 of 9 (permalink) Old 12-15-2017, 03:43 PM
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Are you serious? What's the detector draw?

I imagine there are a few thousand Elises/Exiges driving around with detectors hooked up this way.

and phones, gps units......etc.....

Trust me. Have I ever lied to you before??

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #5 of 9 (permalink) Old 12-15-2017, 04:10 PM
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@Reiver - For an example, I use a Valentine One radar detector. The standby current draw is 225 mA and maximum current draw in an alarm condition is 425 mA.

One amp = 1000 milliamps, or to use the normal abbreviations, 1A = 1000 mA.

A current draw of 225 mA can be added to just about any circuit without adverse effect. The intermittent load of 425 mA is also not enough to create a problem.

The alternative to using an existing circuit is to pull a large gauge wire from the positive terminal of the battery to feed a bus block with fused taps you can use to distribute power to various devices. For a radar detector this would be massive overkill. Just to give you an idea of how much overkill it would be, at 13.8 VDC and 425 mA, you would only have a 2% voltage drop at the end of 40 feet of 22 ga wire (whose diameter is about 0.025”). Forty feet!

Just tap an existing circuit and rest easy. If you want some overkill, tap the circuit with the biggest fuse since your radar detector will be a tiny percentage of the actual load on the circuit.

Glen

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post #6 of 9 (permalink) Old 12-15-2017, 04:32 PM Thread Starter
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Ok, I'll do it.....like I said...electricity is magic....how do they get it in those wires?
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post #7 of 9 (permalink) Old 12-15-2017, 07:01 PM
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Quote:
Originally Posted by Reiver View Post
Ok, I'll do it.....like I said...electricity is magic....how do they get it in those wires?
Simple. Electricity consists of magic pixies. Make a conductive path from battery negative through your radar detector and back to battery positive: the magic pixies will do their dance and take care of the rest.

The pixies for your radar detector will be most happy with 16 or 18 ga wire (for ease of making connections) ...

... connected to an existing switched power circuit through a 2A fuse to protect the wire, and
... connected to ground.

Glen

2011 Lotus Elise SC

Last edited by Glen; 12-15-2017 at 08:32 PM.
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post #8 of 9 (permalink) Old 12-15-2017, 08:03 PM Thread Starter
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Quote:
Originally Posted by Glen View Post
Simple. Electricity consists of magic pixies. Make a conductive path from battery negative through your radar detector and back to battery positive: the magic pixies will do their dance and take care of the rest.

The pixies for your radar detector will be most happy with 16 or 18 ga wire (for ease of making connections) ...

... connected to an existing switched power circuit through a 2A fuse to protect the wire, and
... connected to ground.

Glen


Glen
Oh, I get it now....so when the magic pixies get a case of the azz then they drain your battery by dancing when you least expect it....ah....
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post #9 of 9 (permalink) Old 12-20-2017, 09:09 AM
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Check out post #39 in this thread where I posted the instructions:

https://www.lotustalk.com/forums/f3/r...75/index2.html

If I die, my biggest fear is that my wife sells all my toys for the price I told her I bought them for...
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