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Voltmètre or Ampmeter? #610333
30/12/19 10:15 PM
30/12/19 10:15 PM
Joined: Dec 2019
Posts: 32
Touraine, France
Toucan Offline OP
Just Getting Started
Toucan  Offline OP
Just Getting Started

Joined: Dec 2019
Posts: 32
Touraine, France
Hi all,
On my dashboard l have an indicator posted as a Volt meter round shaped, last on the right side.
On the wiring diagram for 1981 4/4 it is suposed to be an Ammeter.... Needle on 14 (+++) nearly all the time. is this a real Voltmeter, and wiring diagram wrong, or an Ammeter indicating the charging status poetically posted as Voltmeter by the factory? wine
Has anybody got a wiring diag with a Voltmeter? confused2


Toucan 1981 4/4 Kent
Re: Voltmètre or Ampmeter? [Re: Toucan] #610338
30/12/19 10:36 PM
30/12/19 10:36 PM
Joined: Oct 2019
Posts: 1,828
Aberdeenshire
Image Offline
Talk Morgan Enthusiast
Image  Offline
Talk Morgan Enthusiast

Joined: Oct 2019
Posts: 1,828
Aberdeenshire
An ammeter should have brown and brown/white wires going to it and be between your alternator and solenoid.... It should also read both ways from the centre + and -

A voltmeter goes from something to earth, reads one way, and 14 ish volts would be good high charging volts for your battery

Try turning your ignition on... If the meter comes up to 12/13 without the engine running it's a voltmeter (and may rise to 14+with the engine running)

An ammeter will sit (pretty much) with the ignition turned on.... Go negative if you put the headlights on.... Go really negative when you hit the starter... And come back up when it's running (pretty much to the middle if your batteries good or into the plus if it's putting back what you just took out)


K

PS... welcome Toucan... I also have a crossflow engined car.... Gradually being reduced to a chassis before coming back better than ever hopefully

Last edited by Image; 30/12/19 10:38 PM.
Re: Voltmètre or Ampmeter? [Re: Toucan] #610341
30/12/19 10:42 PM
30/12/19 10:42 PM
Joined: Aug 2011
Posts: 891
Aberdeenshire
E
Eddie Cairns Offline
Talk Morgan Regular
Eddie Cairns  Offline
Talk Morgan Regular
E

Joined: Aug 2011
Posts: 891
Aberdeenshire
Yes it is thought for normal use the voltmeter confirms that the electics are working.

A true ammeter in the circuit is a possible failure point in the electrical system and with modern alternator equiped cars since the late 1970's there is no advantage to be gained by having an ammeter.

Only a place for things to go wrong.

Re: Voltmètre or Ampmeter? [Re: Toucan] #610342
30/12/19 10:46 PM
30/12/19 10:46 PM
Joined: Dec 2009
Posts: 27,141
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
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Joined: Dec 2009
Posts: 27,141
Devonshire
As has been said it will be a Voltmeter, Ammeters went out with dynamo's if I recall correctly, think sixties.
Never forget however that it is a Morgan and many owners like adding modifications including to electrics.
A simple definition of the Ammeter is that it has to be in series with the battery whereas the Voltmeter is in parallel with the battery and that can be easily traced. Your reading of 14 does sound very much like the charging voltage to me this is a little high but these instruments are fairly agricultural tbh.

Here is a diagram with Voltmeter courtesy of Lorne.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Voltmètre or Ampmeter? [Re: Toucan] #610344
30/12/19 11:10 PM
30/12/19 11:10 PM
Joined: Oct 2019
Posts: 1,828
Aberdeenshire
Image Offline
Talk Morgan Enthusiast
Image  Offline
Talk Morgan Enthusiast

Joined: Oct 2019
Posts: 1,828
Aberdeenshire
My '75 has an alternator and an ammeter in the 'multi' instrument big dial.... As you say, ammeters are more of a dynamo thing so that is probably a transition thing.... With the voltmeter taking over by the time Toucan's '81 came along.... You can't rush these thing you know! :-)
K

Re: Voltmètre or Ampmeter? [Re: Toucan] #610345
30/12/19 11:12 PM
30/12/19 11:12 PM
Joined: Dec 2009
Posts: 27,141
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
Member of the Inner Circle

Joined: Dec 2009
Posts: 27,141
Devonshire
You are right it is a Morgan after all.
I guess as you say yours is a transition set up.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Voltmètre or Ampmeter? [Re: Toucan] #610347
30/12/19 11:21 PM
30/12/19 11:21 PM
Joined: Jul 2007
Posts: 19,605
Suffolk
John V6 Offline
Member of the Inner Circle
John V6  Offline
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Joined: Jul 2007
Posts: 19,605
Suffolk
The Gomog website will have wiring diagrams


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Voltmètre or Ampmeter? [Re: +8Rich] #610350
30/12/19 11:29 PM
30/12/19 11:29 PM
Joined: Oct 2019
Posts: 1,828
Aberdeenshire
Image Offline
Talk Morgan Enthusiast
Image  Offline
Talk Morgan Enthusiast

Joined: Oct 2019
Posts: 1,828
Aberdeenshire
The 'transition' was probably as long as it took them to run out of the big box of dynamo 'multi dials' they had out back. :-)

K

Re: Voltmètre or Ampmeter? [Re: Toucan] #610351
30/12/19 11:33 PM
30/12/19 11:33 PM
Joined: Dec 2009
Posts: 27,141
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
Member of the Inner Circle

Joined: Dec 2009
Posts: 27,141
Devonshire
laugh2 thumbs


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Voltmètre or Ampmeter? [Re: Toucan] #610356
31/12/19 01:35 AM
31/12/19 01:35 AM
Joined: Sep 2010
Posts: 1,959
Wales
T
Taffmog Offline
Talk Morgan Enthusiast
Taffmog  Offline
Talk Morgan Enthusiast
T

Joined: Sep 2010
Posts: 1,959
Wales
Ammeters were still use with alternators. +/- 30 for dynamos and +/- 50 for alternators.


1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
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