Autometer speedo wiring? - FFCars.com : Factory Five Racing Discussion Forum

 
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post #1 of 8 (permalink) Old 06-18-2017, 11:56 PM Thread Starter
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Autometer speedo wiring?

So, we registered my Dad's car this past week. One of the things that isn't working is the speedo. We've got the Autometer speedometer, TKO600 trans using the electric sensor on the passenger side, and the Ron Francis harness.

The speedo is wired per the FFR instructions and the lighting works in it, but the odometer never shows anything and the needle never moves (I read it's supposed to sweep when power is turned on).

I'm wondering if something is wrong with the speedo or if it is wired incorrectly. When looking at the Autometer instructions, it looks like power is supposed to be applied in two places on the gauge and one of the wires from the sensor is supposed to be grounded. The Ron Francis harness runs both wires from the sender to the gauge.



I'm hoping someone can confirm the correct way to wire this.

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post #2 of 8 (permalink) Old 06-19-2017, 12:54 PM
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My Speed Hut gauge does the same thing. According to the Speed Hut instructions, it won't do anything until the gauge is calibrated. So perhaps take a look in the Autometer calibration instructions and see if you can garner any additional clues.


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post #3 of 8 (permalink) Old 06-19-2017, 11:25 PM
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Are you sure about that RF wiring diagram? The only power going to the speedometer is for the lights. The speed sensor generates an A/C voltage, but not enough to power the speedometer. I would wire it like Autometer says. They made the gauge.
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post #4 of 8 (permalink) Old 06-20-2017, 12:04 AM Thread Starter
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Thanks, guys. I did try to calibrate the speedo per instructions and got no response.

What I've shown is definitely what the Ron Francis harness is doing. I believe that's what's shown in their instructions, but would have to double check this weekend.

I'll plan on re-wiring per the Autometer instructions this weekend - if anyone else with the same setup can confirm whether that's right or wrong before I have at it, I'd appreciate it.
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post #5 of 8 (permalink) Old 06-20-2017, 12:28 AM
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Autometer speedo wiring?

When I first powered mine up with the RF harness wired like they said, it started reading speed with the engine running and driveshaft not turning. It was clocking the miles up fast. Rewired it according to Auto Meter and it has been running fine since.
It does however sound like there's a power or ground problem going to the gauge because the needle should sweep every time it is powered up weather it is calibrated or not.


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post #6 of 8 (permalink) Old 06-20-2017, 02:39 PM
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Quote:
Originally Posted by jloehlein View Post
Thanks, guys. I did try to calibrate the speedo per instructions and got no response.

What I've shown is definitely what the Ron Francis harness is doing. I believe that's what's shown in their instructions, but would have to double check this weekend.

I'll plan on re-wiring per the Autometer instructions this weekend - if anyone else with the same setup can confirm whether that's right or wrong before I have at it, I'd appreciate it.
Your RF diagram doesn't look quite right. I wired the speedometer per the Ron Francis instructions and harness, and the speedometer sweeps when powered up. I did not use the Autometer wiring diagram. The speedometer would not calibrate until I grounded the wire going to the T5 at the transmission itself - see the thread

Calibrating Autometer Speedometer

Steve

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post #7 of 8 (permalink) Old 06-21-2017, 12:46 AM
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I just got through calibrating my Autometer Speedometer and all works fine. The wiring on both the Autometer sheet and the RF are not right if the back of your speedo looks like mine. I labeled the correct tabs to connect wiring to. The AM sheet shows wiring as you have it but the speedo I have (Sport Comp II) doesn't have terminals on the bottom row other than the Ign (key on).

Setting it was a breeze. Second one I've done and both successful.

1. Key off, hold button in (don't let go)
2. Start engine, needle will sweep to top speed (now let go of the button)
3. To start your 2 mile drive, you MUST stop and then press the button again (this starts the sequence and needle will go to half)
4. Drive your 2 miles and stop at 2 miles (not before or after)
5. Press button again
6. All done. Congratulations.

You can always re-calibrate anytime by following the sequence.
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post #8 of 8 (permalink) Old Yesterday, 01:41 AM Thread Starter
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Yeah, it seems like there are a bunch of different speedometers that all get wired differently. I wired up per the Autometer instructions (added 2nd 12v, grounded one wire coming off sensor) and everything works. Calibration was easy!
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