HELP! Last Request - Gen I Shift Light Install

[RTED]

I purchased the Raptor Shift Light for my 95. I need help with the tach wire connection point. The instructions say "VIPERS - Signal off one of the 5 coil drivers??" HELP!!

 

[Jack B]

You need a manual. The Gen1 and Gen 2's are different. The manual will give you a roadmap (schematic) to the PCM. To hook up the raptor on a gen 1, once you find one of the coil-pack drivers (black box on pasenger toe box), merely tap into the wire and bring it into the raptor along with switched power.

 

[Tom F&L GoR]

The wire from the PCM to drive the tach is G21 20GY/LB* (a 20 gauge gray wire with light blue stripe.) One end is on the back of the tach, it passes through position #24 in the 50-way bulkhead disconnect and it's position #43 at the ECU.

The Ingition Controller runs three wires (K43 18DG/GY*, K18 18RD/YL* and K19 18BK/GY*) to the left coil and two (K17 18DB/YL* and K32 18YL/GY*) to the right coil. An ignition feed (A21 16DB) is also run towards the left coil in the wire bundle.

I have a 4-6-8 cylinder Auto Meter shift light, use the tach signal, and between switching different cylinder settings and a pill for a V-8 at 6800, I can light it up at 5440. I can't help you with the coil driver setup.

 

[Steve-Indy]

RTED...this is one of my posts from the long Raptor shiftlight thread.
I hope that it helps!!!

"Different setup on Gen I...from 1995 Service Manual:

Ignition Control Module (4 rows of cavities)...

Cav 6....Ignition Coil #1 Driver BK/GY

Cav 8....Ignition Coil #2 Driver DB/YL

Cav 10...Ignition Coil #5 Driver DG/GY

Cav 12...Ignition Coil #3 Driver RD/YL

Cav 26...Ignition Coil #4 Driver YL/GY

For those INTERESTED, the Gen I tachometter signal comes off of Powertrain Control Module (has 3 rows of cavities) Cavity 43 GY/LB, BUT, remember that the Raptor unit seems unable to use this signal on a Gen II...so it sounds better to stick with a coil driver location for the signal when using the Raptor.

Good luck, and please report feedback on your Gen I hookup."

 

[RTED]

Not working. I connected the green wire to the #43 wire on the wire harness that plugs into the PCM (Grey wire with light blue stripe). I have the red wire on the possitive + side of the radio fuse, black wire grounded. I set the Raptor at 2200 rpm's and receive the correct blink setting (2 for 1000 pause 2 for hundered pause 2 for cylinder setting) Switch 1 - off, switch 2 - off, switch 3 - on. When I rev the motor, past 2200, the Raptor does not light?? Any ideas?

 

[Steve-Indy]

RTED...did you see my post noting that Gen II owners had been unable to get the Raptor to work using the "tach signal"...but had great success using the coil drivers??? Sounds to me like trying a coil driver would be in order.

 

[RTED]

STEVE-INDY, Got it working. I was able to obtain the signal off of the ICM wire harness instead of the PCM wire harness. Was stumped for a while because only two of the five wire color codes for the coils matched (i.e., Cav 6 Coil#1 is suppose to be BK/GY and it is GY/OR . Only Cav 10 Coil #5 and Cav 12 Coil #3 wire color codes matched. I used Cav 10, Coil #5 and the Raptor works great! MANY THANKS to you and the other members for helping me out!

 

[Steve-Indy]

Thanks for the followup, RTED...I was HOPING to that it would work out for you. Unfortunately, there are some "annomalies" in some of the service manuals (especially in the electrical sections), so when quoting the manual in an problem area that I personally have not actually done the mod or repair, I always worry about the correctness of the info quoted.

Again, THANKS for the followup !!!

 

[IEATVETS]

Ed, can you post picks pics of where you are taking the signal from? I am an idiot when it comes to this stuff!

 

[AJT]

I wonder how many people other than me have not installed theirs because...

1 They can not figure out what wire to splice into.
2 They are afraid of peeling back the plastic coating & soldering that close to the PCM connector.
3 Afraid a tap will not work or will damage the wire & it be the wrong one?

Or, is it just me???

Can you tap into on the coil side of the wire? That "seems" like it would be easier/safer.

Service manual came in the mail today, maybe that will help, as long as the manual is right on this subject??

Andy

 

[trainville]

Just peel back a small portion of the plastic several inches back from the PCM head. Wrap on the shift light and start the car. Run the RPM's to your setting and if the light comes on, you've got the right wire! If not, try again and you only have to repair a small bare spot on the wire. If you've got the right wire, just solder that puppy on and you're good to go! With all of the previous posting, it should be easy to pick the right wire.

 

[AJT]

Thanks, I got the manual today, I feel a lot better with diagrams & pics of my year model.

 

[RTED]

Sorry....no pictures taken or available. The ICM harness plug is located on the lower box on the passenger side of the engine compartment behind the tire (The box and harness above the ICM is the PCM). I removed both the driver and passenger panels beneath the dash, six screws each very easy. I ran the cable from the raptor in through the steering wheel opening and behind the radio to the fuse panel under the dash on the passenger side. Leave an extra few inches of cable so that if you want to adjust the rpm setting on the light, you can pull it out from the dash and work on it. Carefully strip away 4-5" of the outer cable covering to expose the red wire near the fus box. Cut the red wire loose from the cable and strip the end. Insert the exposed red wire along with the radio fuse by pushing the red wire end in with the fuse on the sitched side of the fuse holder. Run the cable with the green and black wire (remaining red wire in cable but of no further use) up through the grommet on top of the passenger door hinge under the hood. Make sure you route the cable through the rubber grommet to protect the cable. In addition, wherever there is a sharp edge that the cable may rub against, route the cable through a section of fuel line or rubber hose and tape to secure the hose on the correct rub point. Connect the green wire to the correct wire on the ECM harness as noted in the above posts. Connect the black wire to a good ground. You should be good to go. Good luck!

 

[-FROG-]

On my 94, I have tried #10 and #43 wire on the wire harness that plugs into the PCM (Grey wire with light blue stripe).

Yellow / brown stripe wire. #18 on the lower box worked for me. I tried tests at 1, 2, 3, 4K rpms and 1.5K rpms. Seems to be working as it should. I'll admit, I was confused with all the different posts above. So, here's the breakdown.

94' RT/10 Gen1

Green wire for shift light goes to........
yellow / brown stripe. Lower box (ICM Harness) #18

 

[ruckdr]

Tom,
I know this is an OLD post, but am looking for a little clarification if you will - please.

You said:

The wire from the PCM to drive the tach is G21 20GY/LB* (a 20 gauge gray wire with light blue stripe.) One end is on the back of the tach, it passes through position #24 in the 50-way bulkhead disconnect and it's position #43 at the ECU.

Looking in my service manual, I found the tach wire as you described above, but where from the PCM do I find the wire?
The PCM connectors from top to bottom are BLACK, WHITE, GRAY. The G21 circuit with the gray/light blue wire comes from the PCM C31.

The coil driver wires come from the PCM, A1, A3, A5, A7, A9, and these are from the BLACK PCM connector.
I guess my question is then, are the A... pins on the BLACK (top) connector; B.... pins on the WHITE (middle) connector: and the C.... pins on the GRAY (bottom) connector??

If this is correct, then the Tach wire, circuit 21 would come from pin C31 from the GRAY (bottom) PCM connector??
My wiring diagram says cavity 31 (C31) from the PCM.

Thanks for your help, Tom

Later,