johnseabee Posted October 22, 2014 Report Share Posted October 22, 2014 Hi all, I am looking for a more clear wiring diagram or schematic for the Ammeter connections in the instrument cluster of my '38 Dodge pickup. This Ammeter in my 3 contact posts. One should be battery in, one should be battery out I think but, there is one more that I am not sure of. The Ammeter has a fixed fuse holder that breakes the connection from 1 to the 3rd post. My guess is that would be the post that goes to the rest of the electrical but, again not sure. Any assistance would be greatly appreciated. Thank you, John Quote Link to comment Share on other sites More sharing options...
Young Ed Posted October 22, 2014 Report Share Posted October 22, 2014 I believe in these older cars/trucks that extra post is like the accessory terminal although probably not switched. Quote Link to comment Share on other sites More sharing options...
johnseabee Posted October 25, 2014 Author Report Share Posted October 25, 2014 I followed the one wire that went to that post and it led to the battery terminal on the Voltage regulator??? Quote Link to comment Share on other sites More sharing options...
David Strieb Posted October 27, 2014 Report Share Posted October 27, 2014 The ammeter on my '38 RC has 2 posts on the back. Doesn't seem right that your third post would be wired to the voltage regulator, seems like it would be an accessory power outlet as mentioned before. I'll look to see if I have a wiring schematic. Quote Link to comment Share on other sites More sharing options...
David Strieb Posted October 28, 2014 Report Share Posted October 28, 2014 The ammeter on my '38 RC has 2 posts on the back. Doesn't seem right that your third post would be wired to the voltage regulator, seems like it would be an accessory power outlet as mentioned before. I'll look to see if I have a wiring schematic. I was wrong, my '38 RC ammeter also has 3 posts. I used the fused post to run power to a fuse block from which I run headlights/taillights, dash lights, wipers, heater, and radio from. Also changed over to 12 volt. My shop manual indicates that one unfused post is connected to the power stud on the starter, the other unfused pole is connected to the generator and relay, and the fused post powers the headlight/taillight switch, the horn, and the instrument panel light switch. The manual doesn't indicate what gauge wire was used on any of those circuits. Quote Link to comment Share on other sites More sharing options...
T120 Posted October 28, 2014 Report Share Posted October 28, 2014 (edited) I found this wiring diagram on line,not sure if you've seen it. You can zoom in on the diagram. It shows the connections to your ammeter (U). Edited October 29, 2014 by Ralph D25cpe Quote Link to comment Share on other sites More sharing options...
deathbound Posted October 31, 2014 Report Share Posted October 31, 2014 I was wrong, my '38 RC ammeter also has 3 posts. I used the fused post to run power to a fuse block from which I run headlights/taillights, dash lights, wipers, heater, and radio from. Also changed over to 12 volt. My shop manual indicates that one unfused post is connected to the power stud on the starter, the other unfused pole is connected to the generator and relay, and the fused post powers the headlight/taillight switch, the horn, and the instrument panel light switch. The manual doesn't indicate what gauge wire was used on any of those circuits. If you have the original wiring that isn't too faded (or can be exposed under the cloth loom), here is a chart to determine which wire gauge was used.........http://oldmopar.com/oldmopar/wirecodes.html Quote Link to comment Share on other sites More sharing options...
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