Factory ammeter

RedFish said

The 75 model doesn't have the same amp gauge with all the load routed through it. 75 model has a remote shunt mounted somewhere outside the firewall ( I forget exactly where ). Your amp gauge is connected to the printed circuit board like all the other gauges. .

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Pretty sure all external shunt setups simply use the harness itself as the shunt. I have actually lengthened a harness in a Ferd pu to get the ammeter to be a bit more sensitive. That is a failing of many models with that setup..........the thing is numb. My old Ranger, you could pull on the headlights, you had to 'stare intently' at the ammeter to see if it moved!!