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radioridge

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 Not sure what year this thing is. Older than 76. All gauges quit at the same time. checked power at cluster voltage reg. and there was none. replaced with new one. now all gauges( except amp and speedo) peg when ign is turned on. WTF any ideas?


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94Blazer

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If your guages are pegging then you have a faulty ground to the cluster


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radioridge

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shouldnt this regulator drop voltage to around 6 volts?



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94Blazer

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You can ask Clayne about the reguator . I would check the common ground first. If it has one of those curcuit deals ( I forgot the name of it by my mustang has one and it was bad) it could be bad.The thin deal that is attached behind the cluster . Just sounded like a grounding issue to me. Ill shut up now as it seems these may be a little before my time


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jdabbs

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if guages are peggin out w/ the switch on, then the signal wire (from sending units) are either shorted to ground or bad sending units.  hope this helps


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radioridge

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bad sender was my first thought but all three at once? not that im prefect but i built a new harness for this one last spring. so i sure as hell hope i dont have three seperate wire shorted to ground. i still think its the voltage reg. but so far have not been able to find info on what voltage the gauges should have. this wouldnt be the first time ive bought new bad parts.


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jdabbs

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Most likely all three guages run off the same ground and power, as in the green curcuit board , ohm each guage sender wire and see


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radioridge

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Reply with quote  #8 

they do all run off the same power but get ground thru the senders. this bronco is  1975 or older so no circuit boards.


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jdabbs

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Reply with quote  #9 
With the switch on , unplug the sending unit to each of the guages , and if the guage goes to zero , if so , then you need sending units. If it does not go to zero , then, again, youve probobly got a bad cluster paper thingy.  Guages work off of ground resistance ,not hot.Hot is there just to power up the guage. The more or less reistance in the ground is what moves the needle


Yes they did have cluster boards/paper in 76. 94Blazers 70 mustang has one.

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