Shiftlight Installation. Please help.
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From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
Shiftlight Installation. Please help.
Any way to wire the raptor shift light not using the tach wire????
i had an alarm installed recently and now both the tach and the shift light don't work. If i disconnect the shift light from the tach wire the tach works. I have it wired under the dash. is there any locations i can run ot from (I'm assuming the that the wire under the pass footwell and running to the pcm wouldn't work as well.) I went to the alarm shop and on the way there the tach and the shift light did come on for a few minutes but then stopped working. The alarm shop claimed they don't tap into the tach or nothing like that so it's just a coincidence that the same day they installed the alarm this happened.
could i tap into one of the fuel injectors like the raptor website says???? I just don't know what the problem could be. 
i had an alarm installed recently and now both the tach and the shift light don't work. If i disconnect the shift light from the tach wire the tach works. I have it wired under the dash. is there any locations i can run ot from (I'm assuming the that the wire under the pass footwell and running to the pcm wouldn't work as well.) I went to the alarm shop and on the way there the tach and the shift light did come on for a few minutes but then stopped working. The alarm shop claimed they don't tap into the tach or nothing like that so it's just a coincidence that the same day they installed the alarm this happened.
could i tap into one of the fuel injectors like the raptor website says???? I just don't know what the problem could be.
Thread Starter
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From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
but could it be the same wire that I tapped into already? Does that wire travel across the cabin under the dash and into the cluster???? I will try it tomorrow.
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From: Houston, Tx Got traction?
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St. Jude Donor '07-'08
Originally Posted by DanielW
but could it be the same wire that I tapped into already? Does that wire travel across the cabin under the dash and into the cluster???? I will try it tomorrow.
Make 100% sure your crimp fitting, or however you tapped into the wire is secure, before doing anything else.
Chris
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From: FL
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Originally Posted by DanielW
but could it be the same wire that I tapped into already? Does that wire travel across the cabin under the dash and into the cluster???? I will try it tomorrow.
Thats odd.. perhaps the light is screwed up or maybe you could run a diode to isolate the circuit from the tach and PCM.
Possibly they could have screwed up something or knocked something loose under the dash while installing the alarm.
Thread Starter
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From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
but as soon as i disconnect the shift light from the tach wire, the tach comes on, and when i connect it again, the tach goes to zero.
like i said. the shift light and the tach did come on for about 5 minutes on my way back to the alarm shop so i think the shift light is fine. Has anyone ever tried to wire the shift light to the fuel injector wire like the raptor website says??? which wire would i have to tap into?
like i said. the shift light and the tach did come on for about 5 minutes on my way back to the alarm shop so i think the shift light is fine. Has anyone ever tried to wire the shift light to the fuel injector wire like the raptor website says??? which wire would i have to tap into?
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From: FL
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The PCM switches ground (negative) to fire each injector. They are constant hot 12V with the ignition on. Typically, shift lights/tachs are fired by a ground signal. So therefore you, would want to tap into the ground wire at one of the injectors. The pink wire at each injector is the hot wire, the other one is the negative (varies by injector)
I have never wired one this way, but this "should" work. I've wired 2 MSD switches to the PCM. I always solder the connections for a good clean connection.
I have never wired one this way, but this "should" work. I've wired 2 MSD switches to the PCM. I always solder the connections for a good clean connection.
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From: Newberry FL
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St. Jude Donor '07
Originally Posted by FixedRoof
The PCM switches ground (negative) to fire each injector. They are constant hot 12V with the ignition on. Typically, shift lights/tachs are fired by a ground signal. So therefore you, would want to tap into the ground wire at one of the injectors. The pink wire at each injector is the hot wire, the other one is the negative (varies by injector)
I have never wired one this way, but this "should" work. I've wired 2 MSD switches to the PCM. I always solder the connections for a good clean connection.
I have never wired one this way, but this "should" work. I've wired 2 MSD switches to the PCM. I always solder the connections for a good clean connection.
Melting Slicks
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From: FL
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Originally Posted by mph1972
Good info! BTW, how is everything?!
To tell you the truth, everything is going really well. Couldn't be better actually. Car is running awesome! Having a good time around the shop with friends, tinkering with vette stuff here and there....
. If you go to the Cruise-In, I'll be looking forward to seeing your car there.. take care..Another thing back on the topic, make sure it's not shorting the tach signal to ground. This will cause the tach to take a dump. If it is, and you hook it to the injector, it will cause it to be open... Check for shorts and the grounds...
Steve
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From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
Originally Posted by FixedRoof
Another thing back on the topic, make sure it's not shorting the tach signal to ground. This will cause the tach to take a dump.
Steve
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From: FL
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Originally Posted by DanielW
Can you elaborate???? I'm not really good at this wiring stuff. Again thanks for your time and your help.
There is a way to use a blocking diode to isolate the signal from the rest of the circuit. Basically, it lets the signal pass one way to the light and not backfeed it the other way. Not sure of a part number offhand, but you really shouldn't need one at all for one of these lights. I would check with the manufacturer of the light and see what they say about this problem.
Thread Starter
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From: Shitcago IL
St. Jude Donor '04-'05-'06-'07-'08
IT WORKS
Raptor had very good customer service. They gave me a few suggestions but none of them worked. finally they told me to ship the light to them and they'll try to figure out what's wrong. As I was taking the light off to ship it out, I noticed that the cord was pinched right by the light. The alarm shop installed a little antenna (It's a 2-way paging alarm) and they ran the cable down my a-pillar. My shiftlight is mounted on the a pillar and when they were putting the pillar cover back on they pinched the tach wire with a metal clip that holds the cover to the windshield frame. Light works perfectly now.
Raptor had very good customer service. They gave me a few suggestions but none of them worked. finally they told me to ship the light to them and they'll try to figure out what's wrong. As I was taking the light off to ship it out, I noticed that the cord was pinched right by the light. The alarm shop installed a little antenna (It's a 2-way paging alarm) and they ran the cable down my a-pillar. My shiftlight is mounted on the a pillar and when they were putting the pillar cover back on they pinched the tach wire with a metal clip that holds the cover to the windshield frame. Light works perfectly now.
