I've added the Aux Gauge Pod to my '84 as here: http://www.frontiernet.net/...tt/AuxGageInstal.htm

Everything with both gauges works great, but with ignition on in "bulb test" mode, only the Oil Pressure warning light will light up. Shouldn't the Voltmeter warning light in the gauge pod light up as well? Have I forgotten to wire something?

Thanks...

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3.4L S/C 87 GT www.fierosound.com
2002/2003/2004 World of Wheels Winner &
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Just saw this at work. I will check it when I get home and give you some feedback.

Jack

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If you can not run with the big dogs, stay on the porch!

The battery indicator isn't part of the bulb test, it should be lit whenever the ignition is on and the engine isn't running. But, the 84's don't have a battery indicator lamp, they use a resistance wire instead.

I think your brake lamp should also light on bulb test.

quote Originally posted by spark1: The battery indicator isn't part of the bulb test, it should be lit whenever the ignition is on and the engine isn't running.

It does not do this.

quote Originally posted by spark1: But, the 84's don't have a battery indicator lamp, they use a resistance wire instead.

This is why the bulb does not light? Is there a way to make the indicator lamp "functional".

[This message has been edited by fierosound (edited 09-13-2007).]

For the 84 the only light you have with the ignition on and engine not running is the Check Engine light and the brake light.

That Oil pressure light in the aux cluster is driven internally when the pressure drops below a certain point, (obviously when the car isn't running it's zero) it's not a direct function of an engine sensor that turns on the light.

[This message has been edited by jscott1 (edited 09-13-2007).]

Looked at mine and it is on with the key in the on position on my 88. My 85 I have to do a little more look in, I forgot I do not have a bulb in the socket. I have one in the dash cluster to excite the alternater (spelling) for the 4.9. Will keep loking into this.

Jack

edit: The oil pressure switch and water temperature switch are wired in an “OR” configuration on the 84. If either switch closes, the "oil pressure/water temperature" indicator on the dash will light. (That dash indicator location is the same one used for the battery charge indicator in later models). To make the oil pressure gage work properly while retaining the water temperature warning function, the two circuits should be split. The tan wire from the oil switch (only) comes through the firewall at connector C203, pin "E".

There is no charge indicator on the 84 model. Instead, a resistance wire (10 Ohms) is used between the ignition switch and the alternator. To use the charge indicator lamp in the rally gage it’s necessary to bypass the existing alternator “Field” circuit. The brown wire from the alternator extends through the firewall on pin “B3" of the C500 connector.

[This message has been edited by spark1 (edited 09-18-2007).]

84 Fieros use a resistance wire instead of a bulb in the field wire for the alternator. To get the bulb to work I think you will have to re-wire that wire from the alternator to the bulb as the resistance wire is somewhere in the harness, and maybe even the full length.

quote Originally posted by befarrer: 84 Fieros use a resistance wire instead of a bulb in the field wire for the alternator. To get the bulb to work I think you will have to re-wire that wire from the alternator to the bulb as the resistance wire is somewhere in the harness, and maybe even the full length.

What about putting a bulb in that line? I think the Brown "charge" wire going to the gauge pod is not connected to anything right now.

[This message has been edited by fierosound (edited 09-19-2007).]