[T2] Gas gage weirdness
Bob Reuter accessys at smart.netFri Feb 22 13:13:18 PST 2019
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if I have electrical problems I almost always check the ground first, VW was very good at hiding grounding locations Bob On Fri, 22 Feb 2019, c.dreike wrote: > I figured it out!!! Simple as grounding the gauge case. > I pulled the gauge in my 64 from the dash and suddenly it didn't work either! > I noted that there is a ground terminal on the back and that the mounting > bracket would also provide ground. Once I added the ground wire it worked > properly. Amazing. > I went back to my bay gauge and added the ground to the case and the gauge > now works correctly. Amazing! > > Thanks for the input. > Chris > 71 Sunroof > 64DD Kamper Kit > > On 2/21/2019 4:47 PM, c.dreike wrote: >> Started testing my gas gage and sender. The sender worked when I installed >> it. Currently the tank is very low and the sender reads about 80 ohms. >> According to The Samba this is about correct. The senders run from about >> 3-5 ohms at full to about 70-80 ohms at empty. >> >> When connected, both of the gauges I have read full and a little past. The >> battery voltage is about 11.98. The voltage across the gauges are 6.57 on >> the original gauge and 7.98 on the reproduction gauge. >> >> On the test bench connected to a bench supply, the original gauge reads >> full at about 6.5V and the reproduction gauge reads full at about 7.2V. As >> I reduce the voltage to the gauge, the reading goes down. At 0 volts the >> gauges read empty. >> >> Per the test specs in Bentley, the gauges should read full at about 12V, >> battery voltage. Both my gauges peg when attached to full battery voltage. >> >> I have double checked the wiring against the schematics and all looks >> correct. The circuit looks simple enough. +12V on one side of the gauge. >> The other side of the gauge connects to the sender (5-80 ohms) and the >> other side of the sender connects to ground. >> >> I'm an electrical engineer with lots of experience with simple stuff like >> this and this stuff makes no sense to me. I must be missing something. >> (Kinda like mistaking the wire stripe colors on the turn signal) >> Anyone have ideas on what I should be looking for or doing differently? I'm >> stumped. I'm about to build an inverting operational amplifier circuit that >> would drive the gauge so that it would see 0 volts at empty and about 7V at >> full. >> >> TIA >> Chris >> 71 Sunroof >> 64DD Kamper Kit >> _______________________________________________ >> type2 mailing list >> type2 at type2.com >> https://www.type2.com/lists/type2/listinfo > > _______________________________________________ > type2 mailing list > type2 at type2.com > https://www.type2.com/lists/type2/listinfo > >
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