Radar detector hardwire question - LotusTalk - The Lotus Cars Community
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post #1 of 13 (permalink) Old 09-13-2018, 02:22 PM Thread Starter
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My car: 07 Exige S
For those who are hardwired in any way, does your detector turn off when cranking the starter? And which fuse did you tap? C3 or another?

-Smoky

Last edited by Smoky; 09-13-2018 at 07:34 PM.
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post #2 of 13 (permalink) Old 09-13-2018, 07:09 PM
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For those who are hardwired in any way, does your detector turn off when cranking the starter? And which fuse did you tap? C3 or another?
I connected to the radio 12V supply. Then ran the wires down the center hand brake tunnel to the V1 mounted to the rear inside light. I wired a remote button and display to left side of steering wheel above starter button.
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post #3 of 13 (permalink) Old 09-13-2018, 07:14 PM Thread Starter
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Mostly what I need to know is does your detector shut off when you start the car, along with the connection. Thanks!

-Smoky
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post #4 of 13 (permalink) Old 09-13-2018, 07:25 PM
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Does your radio go quiet when you push the starter button? YMMV
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post #5 of 13 (permalink) Old 09-13-2018, 07:33 PM Thread Starter
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Might be misunderstanding each other...you seem to be asking nearly the same question as a response to my question...

Context: my car is an 07 Exige and very much taken apart for a project so i'm hoping someone with custom wiring work can help a Lotus brother out.

When you start your car does your hardwire radar detector turn off then back on? How is it connected?

Also ya... interested in if the radio turns off when you start the car. Or accessories connected to the outlet. What do they do when you start the car.

Sorry if I am being confusing somehow.

Thanks

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Does your radio go quiet when you push the starter button? YMMV

-Smoky

Last edited by Smoky; 09-13-2018 at 07:47 PM.
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post #6 of 13 (permalink) Old 09-14-2018, 04:33 AM
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@glb has wired a radar detector into his '05...hopefully they would be the same.

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post #7 of 13 (permalink) Old 09-14-2018, 04:40 AM Thread Starter
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Thanks!

But... I would figure there are hundreds of owners with a hardwire setup? I wonder if I'm asking the wrong thing and it is causing confusion.

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@glb has wired a radar detector into his '05...hopefully they would be the same.

-Smoky
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post #8 of 13 (permalink) Old 09-14-2018, 06:40 AM
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I simply used a wire that is not always hot, from the interior fuse block.

Hot only when car runs.

My radio does go away when I start, IIRC.

If the rain ever stops, I can check that, but 99% sure am correct.

--

What is your end goal? I admit to being confused.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS

Driving Tips-https://www.lotustalk.com/forums/f100...art-1-a-49665/
Moss Emergency Line-https://www.lotustalk.com/forums/f100...cy-line-36631/
Safely Piercing Wires-https://www.lotustalk.com/forums/f129...esting-106438/
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post #9 of 13 (permalink) Old 09-14-2018, 06:53 AM Thread Starter
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Thanks I've got it sorted out now.

-Smoky

Last edited by Smoky; 09-14-2018 at 07:43 PM.
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post #10 of 13 (permalink) Old 09-15-2018, 07:44 AM
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My radio does NOT go away when car starts.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS

Driving Tips-https://www.lotustalk.com/forums/f100...art-1-a-49665/
Moss Emergency Line-https://www.lotustalk.com/forums/f100...cy-line-36631/
Safely Piercing Wires-https://www.lotustalk.com/forums/f129...esting-106438/
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post #11 of 13 (permalink) Old 09-15-2018, 08:17 AM Thread Starter
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Quote:
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My radio does NOT go away when car starts.
Thanks!

-Smoky
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post #12 of 13 (permalink) Old 09-15-2018, 09:29 AM
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@Smoky - No one answered your question clearly, so I'll try to shed some light on how automotive electrical systems are generally designed. Most vehicles have at least three types of circuits (the examples in parenthese are typical, not necessarily how Lotus does it):

- only powered when starter is not engaged and ignition key is in the run position (e.g., radio)
- always powered without interruption (e.g., cigarette lighter socket)
- always powered except during start (e.g., parking lights and for some older cars, headlights)

The last type of circuit is designed to relieve the battery of large accessory loads while the starter is engaged. Lotus doesn't do as good a job at identifying these circuits as some other manufacturers. For example, VW uses a system of current tracks for which the nature of the +12V supply is identified.

You didn't say where your radar detector gets power (Lotus did not provide a radar detector power circuit), so there's no way for us to know what type of circuit powers your particular installation. You can obtain the wiring diagram for your particular vehicle from Lotus here.

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post #13 of 13 (permalink) Old 09-15-2018, 09:49 AM Thread Starter
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I have most everything sorted out now.

I am using C3 under the dash to power my radar detector.

I have deleted my stereo head unit. I will have a bluetooth amp driving speakers, but no head unit.

I am assuming that with C3 powering the radar detector that I shouldn't add any more to C3.

I have 3 gauges, 7 amps total.

I have 1 phone charger, 3 amps total.

I need overhead too, so I am considering using a relay to create a switched 12v source from the accessory F1 fuse (20A) and then branch the relay output to each accessory, each with their own appropriately fused connection per the owner's manuals.


Is there a better solution using existing wiring?

Thanks

-Smoky
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