Well this is lengthy, so get your beverage of choice out.



Currently my '91 560 will start up and idle fine, BUT the fuel level, oil pressure, and coolant temperature gauges are all wacky. Fuel level reads empty (has new sender), oil pressure reads ~1.25 bar (on cold start), coolant (new sender) starts at 40°C then shoots up past 120°C within about 20-30 seconds of idle on cold start.

When I disconnect coolant sender, the gauge drops off to nothing. When I disconnect fuel, gauge drops to nothing, BUT! when I disconnect oil pressure it skyrockets to 3 bar.



This all started happening after I removed some crap wiring in the car. I removed the old cel phone that was installed (have done countless times). The aftermarket radio that was there did not work, so I reinstalled the factory Becker, again I know what wires went were on the factory harness, etc.

Also this is when I replaced the CIS sender, Aux fan sender, coolant temp sender, and the fuel level gauge. In addition to the motor mounts and the O2 sender.

Lastly I removed some aftermarket alarm that was installed. It had around six wires total. Of course I taped up what needed to be and heatshrunk the others. Again, I have done this in numerous vehicle I own/have owned.



NOW - I have unplugged about everything I can find under the dash (both sides) and removed every fuse/relay I could minus the No 6 that ran the left side gauges... NOTHING changed. I unplugged the senders as stated above. Disconnected the O2 sensor, disconnected fuel level, CIS, fan, etc, etc, etc

How many body grounds are there? Maybe I messed one up when doing motor mounts?

When going to reinstall the gauge cluster (I had to tape up the ignition switch wires) I missed putting the clock wire to the pin and accidentally hit the back of the cluster with the 12V. It was for a brief instant, but could that have caused my issue?

I don't have another '86+ gasser cluster handy to test so that's the only thing I have not tried at this point. Everything was fine until this and I'm sure it's something simple I am overlooking/not thinking about. Is it possible the plug to the left gauge pod can spin despite the half moon keyway it has?

Is there a way to test that gauge cluster? The grounds behind there all seemed fine. I pushed and pulled on them lightly with no issue. The ones near the battery appear okay also.



Sorry for the length guys but I had to try to explain all I have tried up to this point. If I have forgotten something, point it out and I'll see if I haven't tried it or not yet.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]