Instrument problems

bakerstang · 09-28-2001, 03:01 AM

I've recently taken out my dash and instument console. When I put it back the gauges worked briefly and then went kaput. I've since replaced my fuses and the lights still work inside the console. what else could be blown? Help want to get this project finished.

PKRWUD · 09-28-2001, 05:46 AM

What year?

It really doesn't matter, you probably fried the CVU (Constant Voltage Unit) aka CVR (Constant Voltage Regulator) mounted on the back of the cluster. It's not much bigger than the end of your thumb. It turns the 12vdc signal into a 5vdc signal, which is what the gauges are designed to run on. If it goes bad, you either have no voltage to the gauges, or too much, which may fry the gauges as well. The tach, if you have one, may still work even though the CVU is fried.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

stretchx1 · 09-28-2001, 05:50 AM

try your ground If it's not grounded right it won't work

PKRWUD · 09-28-2001, 09:33 AM

Normally that would be a great suggestion, but not in this case.
The ground for each gauge comes from it's specific sending unit (ie: the gas gauge ground comes from the sending unit in the gas tank, the water temp gauge get's it's ground from the water temp sending unit, etc.). The ground that would affect the cluster would be for the lights, but he said the lights work.

Take care
~Chris

------------------
Retired Moderator
MustangNet

My site: JimPorterRacing

RACECAR spelled backwards is RACECAR

HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-28-2001, 03:01 AM	#1
bakerstang Registered Member Join Date: May 2001 Location: Huntsville,TX,USA Posts: 13	Instrument problems I've recently taken out my dash and instument console. When I put it back the gauges worked briefly and then went kaput. I've since replaced my fuses and the lights still work inside the console. what else could be blown? Help want to get this project finished.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
what if any problems with your Modular Model Gt/Cobra?	fixer	Modular Madness	18	04-03-2005 09:18 AM
Gauge problems	KiltedBanshees93GT	Classic Mustangs	10	08-20-2003 10:01 AM
HELP: Problems after Paxton Novi 1000 install	Meatman	Windsor Power	3	10-17-2002 06:03 PM
'65 - Pull Away Problems - Action Plan	geordie	Classic Mustangs	0	05-14-2002 01:43 PM
continued guage problems	bakerstang	Classic Mustangs	3	10-11-2001 06:00 PM

09-28-2001, 05:46 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	What year? It really doesn't matter, you probably fried the CVU (Constant Voltage Unit) aka CVR (Constant Voltage Regulator) mounted on the back of the cluster. It's not much bigger than the end of your thumb. It turns the 12vdc signal into a 5vdc signal, which is what the gauges are designed to run on. If it goes bad, you either have no voltage to the gauges, or too much, which may fry the gauges as well. The tach, if you have one, may still work even though the CVU is fried. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!

09-28-2001, 05:50 AM	#3
stretchx1 Registered Member Join Date: Apr 2000 Location: kc,kansas,johnson Posts: 30	try your ground If it's not grounded right it won't work

09-28-2001, 09:33 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Normally that would be a great suggestion, but not in this case. The ground for each gauge comes from it's specific sending unit (ie: the gas gauge ground comes from the sending unit in the gas tank, the water temp gauge get's it's ground from the water temp sending unit, etc.). The ground that would affect the cluster would be for the lights, but he said the lights work. Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!