# 2002 GEM ignition key circuit - RFID **URL:** \ **Category:** GEM Forum\ **Created:** [April 17, 2018, 3:48pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577 "2018-04-17T15:48:28Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 17, 2018, 3:48pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/1 "2018-04-17T15:48:28Z")
We are going to put an RFID push button start on our 2002 GEM. I would like someone to check my “math” here. If I read correctly the key circuit uses a 72V ground to activate? -72v on one side and then latches to the other when the key is on. The RFID kit only supplies +12V so I was going to use a Bosch relay as follows: PIN 30 = switched -72V - when on - GEM is on - ORG/Green PIN 87a = Constant -72V - Red/Green - pin 1 of charger PIN 86 = 12V Ground PIN 85 = +12V switched - activate ignition Does this sound correct? Thanks in advance ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 17, 2018, 3:50pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/2 "2018-04-17T15:50:09Z")
Can you share the key circuit for your model. My schematics show 12v. ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 17, 2018, 4:08pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/3 "2018-04-17T16:08:48Z")
![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/6/6c82622a1aba6a32299e61da4351e1c21f4f7764.png) Pin 6 in the screen shot ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 17, 2018, 4:17pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/4 "2018-04-17T16:17:27Z")
Looks correct to me. ![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/0/039b95a44c0e85983aaa002b3d33d1457553b83a.jpg) PIN 30 = switched -72V - when on - GEM is on - ORG/Green PIN 87a = Constant -72V - Red/Green - pin 1 of charger PIN 86 = 12V Ground PIN 85 = +12V switched - activate ignition ---
**Author:** ![grantwest](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/grantwest/32/15_2.png) [@grantwest](https://community.electricforum.com/u/grantwest)\ **Post date:** [April 17, 2018, 11:28pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/5 "2018-04-17T23:28:37Z")
Hey I would like to here how your install worked and what kit you went with ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 18, 2018, 1:04pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/6 "2018-04-18T13:04:25Z")
@grantwest I will be using one of these - > **[Amazon.com: EASYGUARD EC004 Smart Rfid Car Alarm system Push Engine Start button & Keyless Go System Fits for most DC12V cars: Cell Phones & Accessories](https://www.amazon.com/EASYGUARD-system-Engine-button-Keyless/dp/B00HCAYQ0G/ref=sr_1_1?ie=UTF8&qid=1524056489&sr=8-1&keywords=keyless+start+ignition+kit)** We already tried once and really screwed it up as I had no wiring diagrams to work with. I ended up putting +12v to -72V, that does not go over well. I should be easy, one wire from the RFID unit to the relay and another to the brake sensor and all should be good. I will keep the thread updated. ---
**Author:** ![grantwest](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/grantwest/32/15_2.png) [@grantwest](https://community.electricforum.com/u/grantwest)\ **Post date:** [April 18, 2018, 3:17pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/7 "2018-04-18T15:17:03Z")
They have 2 systems #1 Push to start. This system is like a regular button that as long as your finger is on the button the starter is turning. (Great for old cars that don’t fire up right away) #2 one touch start This system is for new cars. You simply touch the button one time and it starts the car. ---
**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\ **Post date:** [April 18, 2018, 3:44pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/8 "2018-04-18T15:44:48Z")
Interested in your reason for wanting to do this? ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 18, 2018, 3:56pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/9 "2018-04-18T15:56:35Z")
Actually this system does #1 and #2, if you just touch it is triggers the starter wire for .74 seconds, if you push and hold it will trigger the starter wire continuous. However, we are not even using the Starter wire. ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 18, 2018, 4:00pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/10 "2018-04-18T16:00:15Z")
The wives have an issue with the key location and orientation (and issues in general 🙂 ). This way they just walk up with RFDI fob and hit the start button - off they go. Plus it just kinda cool, makes it feel like a current car. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 18, 2018, 4:02pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/11 "2018-04-18T16:02:09Z")
Works with the MM to allow high speed when fob is near. Built a couple of them and lost interest. ---
**Author:** ![HandsOff](https://avatars.discourse-cdn.com/v4/letter/h/4491bb/32.png) [@HandsOff](https://community.electricforum.com/u/HandsOff)\ **Post date:** [April 19, 2018, 12:22am UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/12 "2018-04-19T00:22:57Z")
@Inwo That sounds brilliant to me! If I had a car that had many upgrades it would be a nice feature! ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 19, 2018, 9:35am UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/13 "2018-04-19T09:35:06Z")
I may have the parts in a drawer yet if any interest. ---
**Author:** ![HandsOff](https://avatars.discourse-cdn.com/v4/letter/h/4491bb/32.png) [@HandsOff](https://community.electricforum.com/u/HandsOff)\ **Post date:** [April 19, 2018, 5:17pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/14 "2018-04-19T17:17:32Z")
If I understand you correctly, you, having the fob with you could drive a high performance Gem car, while a lesser skilled driver would be restricted to stock performance. A safer situation all the way around. I’m on a low budget for the time being. In fact I have received some criticism for starting this project, but I want a zero emissions and useful car for short trips. Eventually I may be forced to address getting better performance on hills. I live in Santa Cruz, CA, and there are several steep hills in town. I am going to try “Heartbreak Hill” in a few moments because there won’t be much traffic to worry about. I am a bit concerned that the angle may be enough to cause FLA batteries to spill. I’m hoping vented does not mean liquid comes out easily. I have the stock 10" wheels so that may help with power. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 19, 2018, 6:33pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/15 "2018-04-19T18:33:06Z")
![MVC-005F](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/d/df0008251399f368f177995c53e03f40802674cc.JPG) ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 19, 2018, 6:55pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/16 "2018-04-19T18:55:30Z")
I would like to know where you got that kit, Looks like it might have more range than the one I intend to use. We have to get within 3 inches of the ant. to activate the system. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 19, 2018, 7:17pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/17 "2018-04-19T19:17:50Z")
I can look for it. Been a couple years. It’s an active device. Meaning the fob has a battery. I have to move it 3’ away and put it in a tin box to test it turning off. If someone wants to play with it, I’ll send it with the next MM. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 19, 2018, 7:20pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/18 "2018-04-19T19:20:06Z")
> **[RFID car immobilizer engine lock EL-1,intelligent anti-hijacking and circuit cut...](https://www.ebay.com/itm/282166769483?ViewItem=&item=282166769483)** > > RFID engine lock. two way transmit. lock and unlock the car engine automatically. only put the remote inside pocket, the engine will automatically lock and unlock. | eBay! Let me look for an extra one. Bingo! ![MVC-006F](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/d/d38683b432e1e4863ddd21d2ac77bceda5292492.JPG) ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 19, 2018, 7:28pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/19 "2018-04-19T19:28:14Z")
@grantwest Wonder if the battery wasn’t dead when you tested it. Took it out of the box after all this time, and it works fine with a new battery. ---
**Author:** ![MikeKC](https://avatars.discourse-cdn.com/v4/letter/m/90ced4/32.png) [@MikeKC](https://community.electricforum.com/u/MikeKC)\ **Post date:** [April 19, 2018, 7:30pm UTC](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577/20 "2018-04-19T19:30:29Z")
I just ordered an MM (hopefully get it today) can I send you shipping money? I would love to play with it. [Next page](https://community.electricforum.com/t/2002-gem-ignition-key-circuit-rfid/13577.md?page=2)