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CJStefan · 01-01-2022, 11:08 PM

So I just tried testing it. Got the 6v dry battery, made a jumper from the positive battery post to the gauge power post, a jumper from the sending unit center screw to the sending unit input on the gauge, a ground jumper from the sending unit bolt flange to the negative battery terminal and from a ground on the dash to the negative battery terminal. Heres what I saw...it didn't do shit haha. I tried it on the temp gauge and it was the same thing. Either the ground on the dash wasn't good (I tried it in a random hole on the bottom and holding the wire against the gauge cluster housing itself) or the gauges are fired. I'm thinking someone hooked up 12v to the car at some point, maybe to jump it or to charge the battery or something. Now I'm not sure what to do. Anyone have a known good cluster they want to sell?

01-01-2022, 11:08 PM	#12
CJStefan Senior Member Join Date: Oct 2021 Posts: 159	Re: '49 car fuel sending unit testing So I just tried testing it. Got the 6v dry battery, made a jumper from the positive battery post to the gauge power post, a jumper from the sending unit center screw to the sending unit input on the gauge, a ground jumper from the sending unit bolt flange to the negative battery terminal and from a ground on the dash to the negative battery terminal. Heres what I saw...it didn't do shit haha. I tried it on the temp gauge and it was the same thing. Either the ground on the dash wasn't good (I tried it in a random hole on the bottom and holding the wire against the gauge cluster housing itself) or the gauges are fired. I'm thinking someone hooked up 12v to the car at some point, maybe to jump it or to charge the battery or something. Now I'm not sure what to do. Anyone have a known good cluster they want to sell?