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  A really DUMB instrument/gauge question

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Author Topic:   A really DUMB instrument/gauge question
V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 10-29-2002 07:53 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote

I run mechanical oil and water gauges in my '65 GT. I do not have the stock oil and water wiring leads grounded to their senders. The leads are there, just zip-tied up and secured while I'm routing/looming the wiring harness for a cleaner look.

Anyway, my fuel and voltage gauges do not function. I've had the whole cluster out while under restoration, but re-connected everything via the coded diagram I made when I took it apart, and double checked it against a Ford wiring diagram. The fuel sender is new, and I ohm tested it and it's working (9-70 ohms). Do I need all the leads hooked up to get any funciton out of the gauge cluster?

[This message has been edited by V8 Thumper (edited 10-29-2002).]

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SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 10-29-2002 08:44 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
They should all work independantly, otherwise you'd never have a situation where just one gauge is out.

Are you sure your instrument voltage regulator is ok?

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 10-29-2002 08:50 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by SteveLaRiviere:

Are you sure your instrument voltage regulator is ok?


As a matter of fact, no. Is there a test I can do?

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SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 10-29-2002 08:58 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Yes, with the cluster powered up, measure the output voltage. I don't have an early shop manual, but it should be about 2-3v and pulsing, I believe. Usually when they are dead, they are dead, period.

------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 10-29-2002 09:02 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I've got an early service manual, I'll dig it out and look up the values. Thanks

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