Electrical whizz-kids needed.

Dec 23rd, 2002, 19:56

For my 1987 740 GLE TDI wagon with the D24TIC engine, I bought the factory option oil pressure gauge for the instrument cluster. This is a simple hook-up with three wires. One plus feed from instrument cluster itself, one ground and one wire from replacment oil pressure sender unit which is a direct swap. Ok. unbolted the old sender unit, put in the new, fitted cable for warning light as per instructions and the new wire for the gauge next to it as per instructions. Ran the new green wire from sender to gauge and connected that to whole marked G. Then ran power feed as per instructions from instrument cluster power supply and the ground from the same grounding point as the voltage meter. Volt meter working fine and so are all the other gauges but not this bugger. As soon as ignition is on and with the other gauges in operational mode, it goes all the way to the end of the scale and stays there. Any ideas? I have a multimeter and thought I should check some data but what should I look for? My dealer who sold it told me to move the ground from the cluster to the fuse board, but surley the ground is one and the same all over the car?

George

Resident near Leuven in Belgium

'87 745 GLE Turbo Diesel Intercooler
'88 745 Turbo Intercooler

Peter Milnes · Dec 23rd, 2002, 23:35

George it sounds like the sender is wrong or you have put one of the wires in the wrong place. The gauge seems to be acting as if it were a warning light. Are you sure that the gauge and light should work connected together? I think you should have bought a tee-piece connector, replaced the old sender with that and then screwed the old sender into one arm and the new sender into the other arm. You would then have connected the warning lamp to the old sender and the gauge to the new sender.

All the best, Peter

Dec 24th, 2002, 01:15

This is Volvo stuff, comes as a pack with instructions. I agree with you Peter, that it sounds like it is acting like a warning light. The only thing is, if I disconnect the wire from the sender unit, it makes no difference whatsoever to the operation of the gauge.

George

Resident near Leuven in Belgium

'87 745 GLE Turbo Diesel Intercooler
'88 745 Turbo Intercooler

Dec 23rd, 2002, 19:56	#1
George Holmer Guest Location:	Electrical whizz-kids needed. For my 1987 740 GLE TDI wagon with the D24TIC engine, I bought the factory option oil pressure gauge for the instrument cluster. This is a simple hook-up with three wires. One plus feed from instrument cluster itself, one ground and one wire from replacment oil pressure sender unit which is a direct swap. Ok. unbolted the old sender unit, put in the new, fitted cable for warning light as per instructions and the new wire for the gauge next to it as per instructions. Ran the new green wire from sender to gauge and connected that to whole marked G. Then ran power feed as per instructions from instrument cluster power supply and the ground from the same grounding point as the voltage meter. Volt meter working fine and so are all the other gauges but not this bugger. As soon as ignition is on and with the other gauges in operational mode, it goes all the way to the end of the scale and stays there. Any ideas? I have a multimeter and thought I should check some data but what should I look for? My dealer who sold it told me to move the ground from the cluster to the fuse board, but surley the ground is one and the same all over the car? George Resident near Leuven in Belgium '87 745 GLE Turbo Diesel Intercooler '88 745 Turbo Intercooler

Dec 23rd, 2002, 23:35	#2
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: Electrical whizz-kids needed. George it sounds like the sender is wrong or you have put one of the wires in the wrong place. The gauge seems to be acting as if it were a warning light. Are you sure that the gauge and light should work connected together? I think you should have bought a tee-piece connector, replaced the old sender with that and then screwed the old sender into one arm and the new sender into the other arm. You would then have connected the warning lamp to the old sender and the gauge to the new sender. All the best, Peter

Dec 24th, 2002, 01:15	#3
George Holmer Guest Location:	RE: Electrical whizz-kids needed. This is Volvo stuff, comes as a pack with instructions. I agree with you Peter, that it sounds like it is acting like a warning light. The only thing is, if I disconnect the wire from the sender unit, it makes no difference whatsoever to the operation of the gauge. George Resident near Leuven in Belgium '87 745 GLE Turbo Diesel Intercooler '88 745 Turbo Intercooler

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