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> Combo Gauge Wiring, PN 914-641-101-50
gfg3
post Jan 30 2017, 10:43 AM
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I've spent the past several days trying to find a picture of the back of my combo gauge showing the wiring (or a wiring diagram). I have various current flow diagrams and I've found the info for lots of other 914 combo gauges but not for this one (part # 914-641-101-50).

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According to the Parts Vault (thanks for the picture - better than I could have done) this gauge was for 74, 75, 76 914/4 2.0 cars which came without a center console. It's mounted on the left side of my dash. Not working properly, but just in case the PO fiddled with it, I'd like to see how it's supposed to be wired before I dive into it.

I'm not an electrical expert, so simpler is better. Can anyone help? Thanks.

George

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JFG
post Jan 30 2017, 12:10 PM
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http://forums.pelicanparts.com/porsche-914...where-goes.html

is this any good? i'm not good at electricals either so hope it helps
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JFG
post Jan 30 2017, 12:15 PM
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or this?
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gfg3
post Jan 30 2017, 12:54 PM
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QUOTE(JFG @ Jan 30 2017, 01:10 PM) *

is this any good? i'm not good at electricals either so hope it helps


Saw this post, but this is different combo gauge. Good info in the posts about wire colors, but I'd sure like to see how it all hooks up to my gauge. Thanks anyway.

George
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StratPlayer
post Jan 30 2017, 01:02 PM
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Hope this helps


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gfg3
post Jan 30 2017, 01:09 PM
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QUOTE(StratPlayer @ Jan 30 2017, 02:02 PM) *

Hope this helps

This looks like it. Thanks much! If I run into more difficulties once I pull the gauge I'll be sure to ask again. Love this site!

George
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bandjoey
post Jan 30 2017, 01:18 PM
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Or this too
As I was told the temp part requires power, ground, and the wire from the taco plate.

http://www.p914.com/p914_gauges_fuel.htm
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gfg3
post Jan 30 2017, 01:48 PM
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QUOTE(bandjoey @ Jan 30 2017, 02:18 PM) *

Or this too
As I was told the temp part requires power, ground, and the wire from the taco plate.


Thanks! I think that between your info here, the drawing that StratPlayer posted and the info in some of the earlier posts, I should be able to reconstruct "truth". If I come up with a workable drawing I'll post it to get comments.

George
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JFG
post Jan 30 2017, 02:40 PM
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I'm going to need that drawing for deconstructing the birds nest that is my cabin wiring loom. Thanks
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gfg3
post Jan 31 2017, 03:39 PM
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QUOTE(JFG @ Jan 30 2017, 03:40 PM) *

I'm going to need that drawing for deconstructing the birds nest that is my cabin wiring loom. Thanks


OK. Here's what I came up with for the alternative combo gauge for '74 and newer 2.0 cars without the center console. I used several current flow diagrams and photos of the back of an unwired gauge. No warranties expressed or implied. In fact, since I am not an electrical guru, I would welcome anyone who actually can read wiring diagrams to critique this. I think I got the wire colors and connections close to being right, but who knows? Also, all the red/white wires are the various switched power connections. I assume they come together somewhere. Oh, and I know that ground has its own special symbol, but I was too lazy to build it in Powerpoint.

Anyway, please....critique away.

George

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Edward Blume
post Oct 11 2017, 07:37 PM
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QUOTE(StratPlayer @ Jan 30 2017, 12:02 PM) *

Hope this helps

Sorry for the hijack, but is there no black / blue wire necessary for this combo gauge? Its supposed to be the original background lamp, but the combo gauge doesn't seem to have it.
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Larmo63
post Oct 11 2017, 07:47 PM
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All gauge lights are black w/blue tracer....

Right?

Btw, where does one source the teeny bulbs for the center heater control sliders?








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Edward Blume
post Oct 12 2017, 05:43 AM
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QUOTE(Larmo63 @ Oct 11 2017, 06:47 PM) *

All gauge lights are black w/blue tracer....

Right?

Btw, where does one source the teeny bulbs for the center heater control sliders?


Yes, the black with blue tracer is in the Bowlsby original diagram, but the combo gauge above doesn't have it. is this correct?
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worn
post Oct 12 2017, 09:25 AM
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Sort of on topic - the alternator needs the correct GEN warning light bulb to function. If you are tempted to go all LED while you are there, don't use one for that warning light.
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Edward Blume
post Oct 12 2017, 10:28 AM
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Here's the Bowlsby diagram. The black with blue wire is present on stock, but not on the combo gauge. Correct? Do I just tape it off?


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Jonathan Livesay
post Oct 12 2017, 11:05 AM
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QUOTE(gfg3 @ Jan 31 2017, 02:39 PM) *

QUOTE(JFG @ Jan 30 2017, 03:40 PM) *

I'm going to need that drawing for deconstructing the birds nest that is my cabin wiring loom. Thanks


OK. Here's what I came up with for the alternative combo gauge for '74 and newer 2.0 cars without the center console. I used several current flow diagrams and photos of the back of an unwired gauge. No warranties expressed or implied. In fact, since I am not an electrical guru, I would welcome anyone who actually can read wiring diagrams to critique this. I think I got the wire colors and connections close to being right, but who knows? Also, all the red/white wires are the various switched power connections. I assume they come together somewhere. Oh, and I know that ground has its own special symbol, but I was too lazy to build it in Powerpoint.

Anyway, please....critique away.

George

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The black/purple wire goes to the bulb next to the oil pressure light and lights the gauge. Where the circle with the X in it is in the diagram.
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timothy_nd28
post Oct 12 2017, 11:13 AM
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If you put the black/purple wire on a lamp, the engine will cease to run
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Edward Blume
post Oct 12 2017, 11:35 AM
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QUOTE(timothy_nd28 @ Oct 12 2017, 10:13 AM) *

If you put the black/purple wire on a lamp, the engine will cease to run

Are you answering the prior post? Where the X goes?

I agree that the X misses the mark. If you look in post 1 here, its an amber warning light.

Bowlsby's diagram lists it as gauge lighting. #1
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Jonathan Livesay
post Oct 12 2017, 12:05 PM
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QUOTE(Edward Blume @ Oct 12 2017, 10:35 AM) *

QUOTE(timothy_nd28 @ Oct 12 2017, 10:13 AM) *

If you put the black/purple wire on a lamp, the engine will cease to run

Are you answering the prior post? Where the X goes?

I agree that the X misses the mark. If you look in post 1 here, its an amber warning light.

Bowlsby's diagram lists it as gauge lighting. #1

The off white dot is just for looks, no light goes through it, the bulb in that space lights both the gas and temp. gauges.
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Jonathan Livesay
post Oct 12 2017, 12:17 PM
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QUOTE(timothy_nd28 @ Oct 12 2017, 10:13 AM) *

If you put the black/purple wire on a lamp, the engine will cease to run

Yeah, oops I meant to say black and blue wire, does that make more sense? (IMG:style_emoticons/default/dry.gif)
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