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Wiring In an Ammeter

A short description of how to wire in an ammeter or voltmeterfor your Truck.

The ammeter shows direction & rate of current to & from thebattery. Under normal

conditions, the meter should show a (small) charge. This will be higher after

starting, but probably never more than 10A, & often about 1A. If you see a discharge

reading (other than maybe at tickover) you’re running on borrowed time.

The voltmeter also indicates whether the battery is being charged. A reading

of 12V indicates that there is no current flowing into or out of the battery.

Less than 12V indicates discharge (typically 8V when cranking the starter) &

13-14V is a healthy charging voltage. More than 15V when charging indicates a

faulty regulator on the alternator.

A voltmeter actually shows more information than the ammeter, & is also

safer to wire insince it takes no current & this allows the use of a small (1A

or less) fuse. The ammeter needs to take the full normal load. This is 30A or so

for a Seven, but add a few extra lights etc. andit could be more.

Here’s an artistic pic. of how both could be wired in.

Info on this page is © by Sean Houlihane, 1998-2001, & may only be reproduced

in full with acknowlegements, or referenced as a link.

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© 2000-2005 6066 GMC Trucks. Last Updated April 15, 2005.