1965 Ammeter to voltmeter conversion

[Mooney_Pilot]

I am preparing to install a 100 amp alternator, which has a single wire connection and a built-in regulator. Cutting out the external regulator will disconnect the ammeter, but it can be rewired to act as a voltmeter. Basically I just have to add a resistance in series with the ammeter (which is very low resistance) and then connect it in parallel to the battery. Simple enough, but what value resistance should I use? I have seen numbers of 1000 ohm, but that is only a rough guide, ideally I would like the gauge to be approximately central when the battery is OK.

I know of a firm in Texas that will do it for a fee, but since I am in Canada that means shipping my ammeter across the border, twice, and that can be expensive. The concept is simple, I just nee to know what value resistance to use - any ideas??

 

[jimntempe]

I am preparing to install a 100 amp alternator, which has a single wire connection and a built-in regulator. Cutting out the external regulator will disconnect the ammeter, but it can be rewired to act as a voltmeter. Basically I just have to add a resistance in series with the ammeter (which is very low resistance) and then connect it in parallel to the battery. Simple enough, but what value resistance should I use? I have seen numbers of 1000 ohm, but that is only a rough guide, ideally I would like the gauge to be approximately central when the battery is OK.

I know of a firm in Texas that will do it for a fee, but since I am in Canada that means shipping my ammeter across the border, twice, and that can be expensive. The concept is simple, I just nee to know what value resistance to use - any ideas??

This explains it, go to the second half. https://www.niser.ac.in/sps/sites/d...to voltmeter,a voltmeter of range 0 – V0 volt.