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Dash Gauges

New User
Posts: 16
Joined: 11/13
Posted: 11/06/13 01:21 AM

Having trouble with my gauges on my 67 need help  

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Posts: 223
Joined: 04/13
Posted: 11/06/13 08:51 AM

this is a DUPLICATE thread...

he found equal voltage on both wires of the instrument cluster voltage regulator..

on the instrument cluster voltage regulator...

one wire gets switched power..

one wire is to the gauges..

and the mounting tab is GROUNDED to the cluster housing..

but the HUGE question... is  WHERE is the cluster GROUNDED to the body...

and WHERE is the body hooked to the negative battery..???

lets look at this slightly earlier  mustang image..

66 Mustang Cluster Ground Location

if you notice... there is a what is best described as a side forked terminal under the mounting screw for the ICVR...  that is the GROUND wire for the dashboard...

it goes over to the firewall reinforcement...

hopefully there will be a ground strap from the back of the engine to the firewall..

and perhaps.. in addition to that..  a tab part way down the negative battery cable that connects to the body... so it has a negative battery to the body connection on the inner fender...

does your car run???

please spend a minute and run the voltage drop test with your digital volt meter to prove the grounds..

engine running.. headlights on..   digital meter set to 20 volts DC..

1.  Negative to positive battery posts.. 14.1 to 14.8 volts is expected..

2.  Negative post to the engine block.. 0.04 volts DC max.

3.  Negative post to the body.. 0.02 volts DC max..

4.  Engine block to the body.. 0.02 volts DC max..

if you get more than the 4/100 or 2/100 volts across the ground side.. you have a ground issue..

you can run the same test between either the end of a pair of jumper cables laid on the floor and only the negative hooked to the battery... and your volt meter jumping from the end on the floor to the cluster housing..   because there is not a lot of current being used.. i am expecting less than 1/100 volt.. 0.01.. you might need to switch to the 2 volt DC scale .. or run a jumper wire from the end of the negative jumper cable under the car to the cluster housing... see if the ICVR starts working again..

this is a duplicate thread..  

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