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Jul 21st, 2025 | | | | Joined: Aug 2004 Posts: 143 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 143 | Finishing up new wiring on my '51. I picked up a voltage reducer for my original gas gauge. I know this goes in-line with the wire coming from the ignition switch (Coil terminal). Does it make any difference if I mount this on the back of the gauge or is it better if I mount this on the ignition switch terminal? http://www.classicparts.com/1947-54-Gas-Gauge-Voltage-Reducer/productinfo/24-995/ Thanks.
It never costs more to ask and it never costs more to think big.
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
It does not matter, as long as you get the "polarity" correct. There is an input and output connector on the Classic parts resistor. The input connector has a nut on it and that is where the "hot" lead connects. The output connector is connected to input post on the fuel gauge (there is no nut on that lead of the resistor because the nut on the gauge post is used).
Some people say they have gotten along well without such a reducer. Other people have reported many fried gauges, presumably from using non-reduced 12v. I think that there is no harm in using the reducer and it might even save you from frying a gauge.
| | | | | Joined: Aug 2004 Posts: 143 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 143 | Wow, the rookie electrical guy thanks you for the clarification on the polarity. I had this thing installed and will now go back and reverse the installation. I had it backwards.
It never costs more to ask and it never costs more to think big.
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