Redrig
Master Chief Petty Officer
- Joined
- Oct 13, 2009
- Messages
- 860
Hello all,
I am at my wits end on this one and could some help.
quick back story - 78 Plymouth , motorhome , the stock fuel gauge " sorta works " on a completely full tank it reads about 3/4 full .... therefore I dont trust the bottom of that gague. it does drop fairly accurately though , I just never let it get too low.
Last year dropped the tank to install new hoses , checked the sending unit and everything looked great 73-10 ohms and that checked.
This weekend I was trying to install an aftermarket gauge just so I have a better idea of what my fuel level situation is.
When I hook up the aftermarket gauge it basically sweeps all the way , every few seconds when the ignition is on. Almost like a flasher bulb , it will go from no volts to almost 5 volts every few seconds . When the key is off it reads normally ( right now im about 22 ohms from the sender) but as soon as I turn the key on or run the 5 volt thing starts to happen.
My plan was to "T" the fuel sender line and maintain the original gauge , but add the aftermarket one too
Oddly enough - this does NOT have an impact to the OEM gauge and I conformed the voltage is present there too.
anyone have any ideas on how a pulsing 5 volts would end up at the fuel sender line ? its very odd to me
I am at my wits end on this one and could some help.
quick back story - 78 Plymouth , motorhome , the stock fuel gauge " sorta works " on a completely full tank it reads about 3/4 full .... therefore I dont trust the bottom of that gague. it does drop fairly accurately though , I just never let it get too low.
Last year dropped the tank to install new hoses , checked the sending unit and everything looked great 73-10 ohms and that checked.
This weekend I was trying to install an aftermarket gauge just so I have a better idea of what my fuel level situation is.
When I hook up the aftermarket gauge it basically sweeps all the way , every few seconds when the ignition is on. Almost like a flasher bulb , it will go from no volts to almost 5 volts every few seconds . When the key is off it reads normally ( right now im about 22 ohms from the sender) but as soon as I turn the key on or run the 5 volt thing starts to happen.
My plan was to "T" the fuel sender line and maintain the original gauge , but add the aftermarket one too
Oddly enough - this does NOT have an impact to the OEM gauge and I conformed the voltage is present there too.
anyone have any ideas on how a pulsing 5 volts would end up at the fuel sender line ? its very odd to me
