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1985 90, or just a 90 ! - Fuel Guage help


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Hmmm

Cracking on with the list of annoying things, and now the Fuel Guage working, has moved to near the top of the list !

Its not worked for yonks, the fuel low light comes on - and erm "Rather Quickly" now out and about mit new engine :lol:

I have over some time

Changed Tank sender, changed guage for know good one, and had 2 x mates also have a gfo, net result = still no gauge.

Whilst I was fitting my new Stack Temp Guage yesterday I had the dash out (least of the issues nightmare to sort :( ) and noticed that some of the dash wiring has had a bonfire in the long distant past, sorted by cutting away and scotch locking (oooer) a nasty selection of miscoded wires all over the place

Sorting this mess made a few other switces and things that have NEVER worked leap back into life, but I have also found some wires going to wrong bits and as such I am now hugely unconvinced around the fuel guage wiring

Could some kind (souls) take a pic of the BACK of their fuel guage on their 90 (Mine is 1985 flavour so unsure if later will be different ) and show / tell me colours and what wires going where......

Fuel gauage working would be rather good vs the "Light ...Pertrol station NOW" I have at the mo :D

N

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sorry no camera but, passenger side terminal has a plain green wire which is shared with left hand terminal on temp gauge. drivers side terminal on fuel guage has a green wire with a black tracer . just had a quick peek at my b reg 90... hope it helps

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quick update..grabbed a spare instrument binnacle cluster thingymajig out the shed complete with wiring loom off an 89....same color coding on wires as my 84

drivers side terminal is marked "1" has a green wire black trace goes into loom

passenger side terminal is marked "2" has a plain green wire which comes from temp guage terminal "2" then into the loom..

ps...mine is right hand drive...if yours aint, adjust driver passenger side accordingly

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I think the plain green wire that is shared with the temp gauge is the stabilised voltage supply, there may even be a spare in the dashboard (there was in mine) depending on how many gauges you have fitted. green with black tracer goes through the bulkhead and down under to the tank sender for me, which also has a 12v supply, though i don't remember if the colour code is the same on that one

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the spare plain green wire that u can see in the photos above shares the same pin on the connector as the plain green that goes to the temp and fuel gauges. i think its just a positive switched on by the ignition, could well be a stabilized feed on later models...

i used the spare green as the feed to my volt gauge, which registers anywhere from 12.5v with ignition on engine off upto nearly 14v with the engine running with some revs on.

the red wire with white trace is the feed for the dash lights

the short black one is an earth

the long black one is also an earth

the long brown wire as far as i can remember is a permanent positive.

the green with black trace that comes from terminal 1 on the fuel gauge goes via the loom to the big spade connector on the sender unit on the fuel tank...

not had any fires in the 9 years orso that iv owned it...

post-17156-0-88491800-1359408746_thumb.jpg

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There is no stabilised feed on pre-ECU models. Don't know about later ones.

The temp. and fuel level gauges are actually wheatstone bridge circuits so they are independent of minor changes in supply voltage. If the needle moves for any reason other than changes in the fuel or temperature level then there is a bad connection somewhere.

For the under-seat tank on my 90, reading from the back of the vehicle, the wire colours on the fuel tank sender are black, white/slate, green/black.

Nick.

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My loom (and this may be standard) had two separate paired bullet connectors, green and green/black, 'on' the bulkhead in the engine bay.

For a while after rebuilding, my gauge didn't work and I couldn't for the life of me work out why. I eventually found the other identical bullet connectors, swapped the connector and suddenly the gauge started working! I had a look at the wiring diagram and there is a secondary tank gauge feed which is what I'd obviously plugged in. Simple enough mistake to make (I think) seeing as the wire colours and connector are identical. Might be worth a look?

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