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old109er

Active Member

• Mar 24, 2014

• #1

filled tank of series 2a 109 and found it shows only half full on gauge.

if unplug sender unit wire it goes full tank off the gauge.

took top off sender and there a wound wire and slider prongs and all seems ok but goes from 0 empty to 100ohms full.

is there another sender unit that goes 0 to 200 or more.

dash gauge is older one without voltage reg on back.

or can i mod the sender adding resistors to it?

 

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CalumM

Active Member

• Mar 24, 2014

• #2

Sometimes you just have to bend the sender so it sits at the right point.

 

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old109er

Active Member

• Mar 24, 2014

• #3

Already tried that and ended up taking complete sender unit out but still only got 0 to 100 ohms on full sweep.

Need sender with more total overall resistance But Iis there one?

 

RomeoV

Member

• Mar 24, 2014

• #4

Surely if it is just the resistance that is causing the problem you could just put a resistor is series with the circuit so you get a higher reading but then wouldn't that effect the zero reading? I still need to connect mine on my land rover (fix it)

Im not sure if one exists with a higher resistance as one of my friends had the same problem and he looked everywhere for one.... maybe one exists. Although he got around it by adding more earths to the sender unit.

 

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old109er

Active Member

• Mar 24, 2014

• #5

did read somewhere about adding a resistor but yes that would cock up the zero - empty reading so win one end lose the other.

have tried extra earth to lots places and a long one to battery but no change.

hoped there would be other sender unit ..................

next step i think is strip and rewind internal unit to get more linear resistane .

if no good ill be after a replacement sender....

 

Aidso

New Member

• Mar 24, 2014

• #6

Check your grounds. If you move sender manual how does the gauge read?

 

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old109er

Active Member

• Mar 24, 2014

• #7

with sender out the tank and using full movemet of float travel means gauge goes from empty to half a tank.

grounds checked and double checked with multimeter to ensure no resistance found ie good earth.

will get some resistors and try find what gives a full tank on the gauge and see.

 

jamesmartin

Well-Known Member

• Mar 24, 2014

• #8

i think youd need a new sender ,greater resistance will only make guage read lower

 

The Mad Hat Man

Well-Known Member

LZIR Despatch Agent

• Mar 24, 2014

• #9

jamesmartin said:

i think youd need a new sender ,greater resistance will only make guage read lower

Click to expand...

wot he sed ^^^^^^^^^

fsd normally equals 12volts.

 

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old109er

Active Member

• Mar 24, 2014

• #10

thought about new sender but could not find one when i looked to replace this.

if anyones used a new plastic topped one then please send a link or poibt the way.

cannot go through pain of bleeding perkins fuel system when run dry...

 

Attachments

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  sender top.jpg

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jamesmartin

Well-Known Member

• Mar 24, 2014

• #11

will this not fit
https://www.google.co.uk/url?sa=t&r...y4HwCw&usg=AFQjCNFrifeEq4Oc3rwYQMHOEOWZ_KfepA

 

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old109er

Active Member

• Mar 25, 2014

• #12

Looks ok from bolt pattern

Need checl what resistance gauage wants to see then call see if the sender falls in that range.

Be weekend before get to it as have filler neck to swap and gearbox oil to check

Post back finding later

 

dominicbeesley

Well-Known Member

• Mar 25, 2014

• #13

Are you sure you're figuring this right? I'm pretty sure my guage reads (over)full when shorted to earth and empty when disconnected.

I had in the past managed to rig up a non-standard (ford) head unit to a wrong sender (Land Rover) as I couldn't find a proper one for my bus. With some simultaneous equations and a bit of head scratching I worked out how to mod it with 2 resistors to give pretty much perfect full and empty readings.

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