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Old 03-17-2007, 05:15 PM   #1 (permalink)
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resistor for gauges..... 8.5 ohms????


Aparently the problem I'm having with my gauges is that there is no resistor on the gauge power wire. According to this diagram I need an 8.5 ohm resistor on the supply wire.



The problem I have with this is that I'm trying to find an 8.5 ohm resistor and I'm not having any luck online. Radioshack.com doesn't list an 8.5, and the closest thing I have found is an 8.2

I also don't know the other criteria like wattage etc. that I'm looking for. If you guys could point me in the right direction without me having to take a course in electrical engineering, I would really appreciate it.

Here's the closest thing I have found:

http://www.partsexpress.com/pe/pshow...number=015-8.2
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Old 03-17-2007, 06:18 PM   #2 (permalink)
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resistor for gauges..... 8.5 ohms????

The Pink color wire coming from the ignition switch is the the 8.5ohm resistor. No need to buy anything from Radio Shack. The resistance is in the wire itself. See http://www.1bad6t.com/images/wiring.gif Do not molest this wire or you messed up.
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Old 03-18-2007, 11:48 AM   #3 (permalink)
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resistor for gauges..... 8.5 ohms????

Quote:
On 2007-03-17 18:18, 1bad6t wrote:
The Pink color wire coming from the ignition switch is the the 8.5ohm resistor.
Unfortunately I don't have the cluster portion of the original wiring harness. The harness for the gauges had been torn out along with the cluster before I bought the car. I got a cluster from E-bay and a "painless" style universal harness kit. To make matters worse, my Ebay cluster didn't come with the panel/warning lights, so I'm gonna have to improvise a solution for those.

All that was left of the original wiring harness was the headlight switch, and some of the original wiring to the engine and lights that the previous owner had butchered up.

I've been studying the diagrams on your site for a long time but since none of the original parts are there I'm having to do a little bit more reaserch and improvisation.

I'm having a bitch of a time finding an 8.5 ohm resistor, Radioshack doesn't carry an 8.5 (they do have an 8 ohm), and internet searching isn't turning up much either. The closest I've found is an 8.2 ohm. I might be making a trip to the junkyard to get the pink wire. Is there anything special about it that I should know? I'm assuming it will have the resistor in the middle and regular wire on the ends that I can solder into place, right?
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Old 03-18-2007, 01:11 PM   #4 (permalink)
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resistor for gauges..... 8.5 ohms????

The Pink Wire is made of special stuff to have the correct ohms of resistance. It does not have a resistor like on a circuit board like in a TV or radio. It kinda looks like aluminum wiring instead of copper. I see that Summit Racing has a 1.82 ohm resistor. I think the .03 difference is not gonna hurt you.
http://store.summitracing.com/partde...5&autoview=sku

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Old 03-18-2007, 09:22 PM   #5 (permalink)
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resistor for gauges..... 8.5 ohms????

Per the wiring diagram in my '6-63 Falcon factory shop manual there is no resistor or resistor wire in the gage circuit.
There should be 12 volts from the ignition switch going directly to the instrument voltage regulator.One terminal of the gage should be getting voltage from the instument voltage regulator,about 5 volts or pulsating 0 to 10 volts using a volt meter. The other terminal of the gage goes to the tank sending unit.The temp gage is hooked up the same way.


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Old 03-18-2007, 11:53 PM   #6 (permalink)
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resistor for gauges..... 8.5 ohms????

You are correct Jim. I looked at the diagram close this time and the resistor is for the ignition system, not the gauges. The IVR is feed 12v from the ign switch.

Sorry Eric. I will look into where I got that schematic. But you will still need an 8.5 ohm resistor to feed the points in the distributor or you will shorten the life of the points




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Old 03-19-2007, 01:12 PM   #7 (permalink)
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resistor for gauges..... 8.5 ohms????

Quote:
. But you will still need an 8.5 ohm resistor to feed the points in the distributor or you will shorten the life of the points
No need to worry... I don't have points anymore. I installed Duraspark the other day. The car runs much better now. Will I still need a resistor with the Duraspark?

So the resistance wire is actually on the sending unit then? All I know is that I run 12v to the little regulator and my needle goes all the way off the gauge, regardless of how much fuel is in the tank. I'll get a voltmeter on the regulator thing and see what the output voltage is and if it pulses
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Old 03-19-2007, 05:14 PM   #8 (permalink)
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resistor for gauges..... 8.5 ohms????

You still need the resistor wire or a resistor for the Duraspark.
http://www.1bad6t.com/duraspark.html

The sending unit in the gas tank uses a variable resistor, more like a rheostat. The instrument voltage regulator get a full 12 volts
http://www.1bad6t.com/fuelgaugetest.html

By the way, the pic you posted originally came from a Mustang site. What year 'stang I don't know?

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<font size=-1>[ This Message was edited by: 1bad6t on 3/20/07 8:15am ]</font>
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Old 03-19-2007, 05:44 PM   #9 (permalink)
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resistor for gauges..... 8.5 ohms????

Quote:

The sending unit in the gas tank uses a variable resistor, more like a rheostat. The instrument voltage regulator get a full 12 volts
So this means that either my IVR or my fuel sending unit is bad, right? I still haven't got a chance to multi-meter my IVR.
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Old 03-19-2007, 08:52 PM   #10 (permalink)
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resistor for gauges..... 8.5 ohms????

Correct. ...or gauge ...or ground ...or wiring. See how the IVR checks out first and we take it from there
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Old 03-23-2007, 06:34 PM   #11 (permalink)
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resistor for gauges..... 8.5 ohms????


So I tested the IVR today with a digital multimeter. The results are inconclusive. It flashes like a blinker flasher, but the flashes range anywhere from 12v to 2 v. Could it be that my IVR is fried?

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Old 03-23-2007, 09:01 PM   #12 (permalink)
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resistor for gauges..... 8.5 ohms????

Per the factory manual the IVR should pulsate from 0 to 10 volts. Your readings of 2 to 12volts indicate the IVR is probably OK. The same manual says to hook up 2 flashlight batteries( 6 volts) to the gage and it should read Full.It's hit or miss which terminals are - and + though. My guess is the tank unit is bad or the wiring to it. From your gas mileage post it sounds like the gas doesn't stay long enough in the tank to get a good reading on the gage anyway.

<font size=-1>[ This Message was edited by: Just Jim on 3/24/07 12:02pm ]</font>
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Old 03-23-2007, 09:05 PM   #13 (permalink)
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resistor for gauges..... 8.5 ohms????

The IVR checks out fine. What exactly is the problem are you having gauges? Is it inaccurate, dead or pegged? Is it one gauge or both? The reason I ask because we might be chasing a bad temp sending unit. If itís only the fuel gauge staying pegged then itís a bad ground at the tank or the sending unit. Take a hose clamp and clamp a dedicated ground wire to the sending unit between the tank and rubber hose and the other end to a good clean ground. If the gauge is still pegged to the top itís the sending unit. If the fuel gauge is not moving at all itís the gauge itself.
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Old 03-23-2007, 11:08 PM   #14 (permalink)
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resistor for gauges..... 8.5 ohms????


The problem I'm having is that the gauge is pegged whenever I turn on the ignition switch. I am only experiencing this with the fuel gauge. There isn't a temperature sending unit because a previous owner installed a mechanical temp gauge (which doesn't work anymore btw).

Do all 200 6 cyl's take the same temp sensor? And would that sensor be compatible with my '62 gauge? I might try and snag a temp sending unit from the junkyard and see if the temp gauge is functioning correctly


The resistance on the fuel gauge wire is around 8 ohms. The tank has about 5 gallons of gas in it.

I'll test the sending unit tomorrow mand report back my findings.
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Old 03-24-2007, 06:37 PM   #15 (permalink)
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resistor for gauges..... 8.5 ohms????

Heres the engine bay, the wiring is a mess because I'm still working on it. I didn't get the complete harness for the duraspark so I had to improvise a little. I have to get another D-spark harness, connect the neutral safety, and wrap the entire harness in the bay so it looks OEM.


Here's the back of my cluster, anyone know where I can get bulb holders for the gauge lights and indicator/warning lights?
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