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New Volt Gauge reading high at times.
#1
Question for Midlife...……. or anyone else with extensive electrical knowledge.

As most know, I recently installed a set of Bosch aftermarket gauges in my Mach 1. I'm absolutely loving having the Temp, Oil and Volts right there in front of me, well to the right side actually!!
On the return trip from the Ford Mustang Memories car show and the longest run my car has been on since installing said gauges, and whilst waiting at the border, I noticed that the Volt gauge was reading quite a bit higher than the usual 14 volts, engine running. It went up to just above 15V. The temp gauge was a tad higher than normal also, but that was not surprising sitting on a hot day. My feeling is that the 14 gauge wire I used to connect the volt gauge might be a bit too light and it was over heating causing the higher than usual reading.
As my car does not have any ACC terminal at the fuse block, I had connected to the wire I installed for my Rocketman tach conversion, basically because it was there and an available switched 12v wire. Normally, I don't see this higher reading. My voltage regulator is new(ish) so that's should not be the reason although possible I guess. I'm sure that the very hot weather has an impact on many things, this being one of them.
So, what's the opinion as to cause?
Geoff.
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#2
Voltage regulator is no longer regulating. The reason why your temp gauge was a tad higher than normal is that the input voltage was also a bit higher than normal.

Let me check your shorts!
http://midlifeharness.com

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#3
(08-27-2018, 06:34 PM)midlife Wrote: Voltage regulator is no longer regulating.  The reason why your temp gauge was a tad higher than normal is that the input voltage was also a bit higher than normal.

 I had a sneaky feeling it might be something like that. Damn repops!! Any suggestions as to what and where to get a GOOD one? Would this still be the case when under normal outside temps, it seems pretty close on the temp gauge, about 190 with a 190 stat and 14 Volts when running, 12 not running?
 At least I won't have to go pull the dash apart again to replace a wire.
Thanks very much for your valued input.
Geoff.
  Reply
#4
(08-27-2018, 06:34 PM)midlife Wrote: Voltage regulator is no longer regulating.  The reason why your temp gauge was a tad higher than normal is that the input voltage was also a bit higher than normal.

+1
14 gauge wire is plenty big, an analog voltmeter draws very little current. 16 or 18 gauge is fine for them.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#5
A Motorcraft electronic one is all I use. If you want it to look original you can replace the cover with your period correct cover.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
  Reply
#6
(08-27-2018, 08:47 PM)Don C Wrote: A Motorcraft electronic one is all I use. If you want it to look original you can replace the cover with your period correct cover.

+1 on the motorcraft electronic regulator.

'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#7
Geoff, your car is to nice to risk a battery boil over and mess up all that detail work you have done. It's just a matter of when it's going to happen and not if it will happen.
Use Ford FOPZ-10316A  or Motorcraft GR-540-B. Ford replaced all mechanical regulators in the 80's with the electronic style. So anything you see with the Autolite/Motorcraft tall covers (especially the Concourse units ) are licensed by Ford but are NOT genuine Ford parts . Most of those are the old point/contact style made in China. 
If you want the "Look" you can always switch the old style cover to the new regulator.

Steve

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!
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#8
runninpony 
+1 on electronic regulators, put it inside your "original" cover. Any 71-73 Mustang is too nice to have a battery boil over! Ask me how I found out!

71-73 Mustangs never die, they just go faster!
  Reply
#9
(08-27-2018, 08:33 PM)Stanglover Wrote:
(08-27-2018, 06:34 PM)midlife Wrote: Voltage regulator is no longer regulating.  The reason why your temp gauge was a tad higher than normal is that the input voltage was also a bit higher than normal.

 I had a sneaky feeling it might be something like that. Damn repops!! Any suggestions as to what and where to get a GOOD one? Would this still be the case when under normal outside temps, it seems pretty close on the temp gauge, about 190 with a 190 stat and 14 Volts when running, 12 not running?
 At least I won't have to go pull the dash apart again to replace a wire.
Thanks very much for your valued input.
Geoff.

My voltage was doing the same thing last week and replaced the VR to bring it back to 14.2v.

If you dont want to buy a generic and replace the cover route, VCM has a solid state one with correct covers. They also have a solid state instrument panel VR.

For my car it was.....  http://www.virginiaclassicmustang.com/Vo...P1330.aspx
  Reply
#10
So the new gauges just paid for themselves.... as a problem was indicated in the readout and you paid attention to it before it got really expensive.....
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