Fuel Gauge

[blackstack]

Looking for the magic answer....When I turn on my headlights the gas gauge pegs at "Full" and stays there....I guess it is a bad ground somewhere any ideas where to check first?

Words of no more than one syllable please

[Jim LaGuardia]

Check the ground wire for the guage first, then follow the circuit and check the connection points. The circuit usually ends at a spade connector attached fwd and to the rt of the headlamp relay.

[blackstack]

My sender unit has two spade connectors but only one has a wire going to it.....is this correct ?

[Jim LaGuardia]

Yes, that is correct. The spade faceing left is to the guage, the one facing forward can be configured to add a low fuel lite.

If you wish to add in the light, you will need to get the circuit details from Jim Mettler, as he is the only one I know of that has done the mod.

[blackstack]

Hello Jim....I am so glad your brain is available for picking!!!!

I have a swiss 710

I released the old gauge from the panel. It has two spade connections, one labeled G and the other labeled +. There was a spade and "hole" connection on one of the machine screws that holds the gauge in place but there was nothing on the spade part....my search for a wire that might have been attached has been unsuccesful so far...I assume it is a ground wire

I have a new gauge that I bought from SAV. It has three nut and bolt connections (plus the light connection) One connection marked +, one marked S and the center post has no marking.


The symptoms of the old gauge are....needle goes to half full no matter if the tanks is empty. If you fill past empty needle goes further towards Full. If you turn the headlights on the needle pegs at full.

Any suggestions? I would prefer that the old gauge be made to work. Should I run a ground wire from the empty spade?

If I have to use the new gauge is S the same as G? is the middle unmarked connection a ground?

Thanks in advance for any input.

Bob Gray

[Jim LaGuardia]

For the SAV guage, the case on the replacement guage is isolated from the components. Wire as follows, +=24v(black wire), S=sender signal,(purple, from tank), center terminal is ground(tan wire).

[blackstack]

thanks for the help !! I ran a new ground for the old gauge and it seems to be working properly (could not find an unoccupied brown wire)
If it doesnt work out you gave me the hookup for the SAV gauge and I have it on standby.

Thanks again!!

Bob Gray

[Jerbearyukon]

I pulled it out - light works but needle is not working.

I have 24 volts between the black and the brown

zero volts on the orange to brown
zero volts on the purple to brown, but the puple looks a bit darkened by the spade connector going on the terminal of the guage.

it says on the electrical wiring diagram that the purple goes to number 32 which is a switch for the fuel gauge I take it that the switch is in the tank right.

Going to pull the purple off and cut it shorter and see if it shows 24 volts then...SHOULD IT?

Jer Bear

[Jerbearyukon]

I took it out, but how can I check if the gauge is faulty or not....can you meter it or put power to it??


Thanks
jer Bear

[edzz]

look here may help

http://pinzi.us/html/fuel_gauge_repair.html

http://www.sdp-pinzgauer.org/html/fuel_gauge.html

remember don't let all the smoke out

Ed

[Jerbearyukon]

thanks I will give it a go

jer Bear

[Jim LaGuardia]

I took it out, but how can I check if the gauge is faulty or not....can you meter it or put power to it??


Thanks
jer Bear

Why did you remove it?
If everything is connected properly all you have to do to test the guage is ground the sender wire and the guage should peg. If it does, look at the sender, not the guage

[Jerbearyukon]

Ok Jim if I read you correctly then I need to ground the purple wire right and the fuel gauge should peg.

Thanks

jer

[Jim LaGuardia]

"Touch" the purple wire to ground, if the needle moves to full the guage is ok.

[Jerbearyukon]

thanks - I will check it out tomorrow.

Jer Bear