Where's the Ammeter Shunt?
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Glad it worked out. My only concern is that in the '81 EVTM it states that there are differing sizes of shunt depending on the size of alternator - 60 vs 70 amp. Extrapolating that, a 3G would take a much bigger shunt. Apparently they set it up so the ammeter's scale would be adequate for the full output of the alternator.
Having said that, if you don't use the current capability of the alternator then the size of the shunt won't be a problem. IOW, if you don't start the truck using jumper cables due to a dead battery and then rev it up so the alternator can throw its full charge there isn't a need for a larger shunt.
Having said that, if you don't use the current capability of the alternator then the size of the shunt won't be a problem. IOW, if you don't start the truck using jumper cables due to a dead battery and then rev it up so the alternator can throw its full charge there isn't a need for a larger shunt.
Senior User
Joined: Oct 2012
Posts: 497
Likes: 4
I understand and agree completely. As much as I would be tempted to come up with a scheme to load the alternator to 130A I'm afraid that's asking for trouble. 130A is a LOT of current! With that in mind, I have a 1 amp fuse in line with the ammeter to save the day if I surpass it's it's limit.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
I understand and agree completely. As much as I would be tempted to come up with a scheme to load the alternator to 130A I'm afraid that's asking for trouble. 130A is a LOT of current! With that in mind, I have a 1 amp fuse in line with the ammeter to save the day if I surpass it's it's limit.
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