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Old 02-22-2014, 04:18 PM   #1
didenpx
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Default 1977 240 Instrument Cluster Wiring

I have pulled my R-sport cluster to get some stuff sorted out and am trying to swap in a 1979 instrument cluster so that the car can be driven in the meantime.

I have the circular and half moon plugs connected but am getting no idiot lights when the ignition is switched on and also no readout on gas or temperature. High beam indicator and directionals work.

I looked at Haynes and the pinout of the 77 and 79 circular and half moon plugs seems to be the same. Looking for some hints or troubleshooting advice.
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Old 02-22-2014, 04:56 PM   #2
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Gas or temperature problems? Swap out the voltage stabilizer for a working one or make a new one like this:

http://www.164club.org/spanreg.html

Had that problem too with swapping the original to a R-Sport, this solution fixed it.

Edit: Idiot lights problem as well btw, new exciter wire from D+ on alternator to firewall plug (which goes to red wire -> cluster) solved the problem.
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Old 02-22-2014, 06:10 PM   #3
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http://www.ebay.com/itm/291083368163...84.m1555.l2649
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Old 02-22-2014, 06:55 PM   #4
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Thanks Dennis and KJOP.

Is there an easy way to test the regulator that I have to confirm that it is the problem?
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Old 02-22-2014, 07:06 PM   #5
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On second thought.....I pulled it out and pried the circuit board out of the shell and this is what I found:

[IMG][/IMG]

There's a good electronics supply place near me and I've got a decent soldering station so I may go the DIY route.
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Old 02-23-2014, 11:27 AM   #6
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Go DIY. Gives much more accurate readings than with the regular voltage stabilizer.
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Old 02-23-2014, 05:56 PM   #7
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Quote:
Originally Posted by DennisvdB View Post
Go DIY. Gives much more accurate readings than with the regular voltage stabilizer.
The IC should be on it's way (it was cheaper to buy it online than to pay for the gas to get it). Definitely going the DIY route.

Once I have it put together I'll report results.
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