Dry earth?
Help again please ...
I already have a dead tach, clock and ABS light - but now the radio and heater fan have gone too. All fuses are good so I am thinking from previous comments that all the earth points need a scrubbing - but where are they?
Any advice will be gratefully received!
Alan
460 or 463?
460 right up behind drivers A pillar... u above the relay / fuse board
463 will have to look...
Have you checked the OVP Relay fuse(s)?
Looks like this, is located with fuses under glove box
Have you checked the OVP Relay fuse(s)?
Looks like this, is located with fuses under glove box
I am off now to do that thing - thanks.
Have you checked the OVP Relay fuse(s)?
Looks like this, is located with fuses under glove box
I am off now to do that thing - thanks.
I don't have one of those ... just a row of standard fuses 
Pretty sure 463 has an OVP....
Pretty sure 463 has an OVP....
This all I have:
you need to remove the two philips screws on the top corners of the black. metal fuse panel. it will then drop down on a hinge and reveal all the relays behind it.
Behind or above the fuse board on the left footwell
I knew that - just testing ... or just asleep. And whilst I am there I can check the ruddy grounds as well.
Stupid question #1: how will I know if the fuse is dead? Multi-meter and my electronics engineer?
Hi, usually it's pretty obvious when it's blown, remove the fuse and you'll see the wire burnt
The 463 definitely has an OVP, it's with the other relays. It supplies the abs, tach and something else.
You need to be able to use a multimeter to be able to diagnose the electrical faults.
There is a little slot for checking fuses on the LHS of the fuse board. Insert the fuse and the light comes on
Gentlemen - checked the OPV relay fuse, it was blown; replaced and nothing has changed (and it has not blown again). Faulty relay? I have an electronics engineer here - who usefully is also a petrol head ... instructions he will follow!
The question becomes - does anyone know what the pin outs on the OPV relay do?
Numbered - 87E, 87E, 87L, 30, 30A, 15 & 31
I knew that - just testing ... or just asleep. And whilst I am there I can check the ruddy grounds as well.
Stupid question #1: how will I know if the fuse is dead? Multi-meter and my electronics engineer?
By that I meant the relay not the fuse - even I can spot a dead fuse (with my specs on!).
Gentlemen - checked the OPV relay fuse, it was blown; replaced and nothing has changed (and it has not blown again). Faulty relay? I have an electronics engineer here - who usefully is also a petrol head ... instructions he will follow!
The question becomes - does anyone know what the pin outs on the OPV relay do?
Numbered - 87E, 87E, 87L, 30, 30A, 15 & 31
OK - found the wiring diagram in the members' area. Relay definitely dead but shorting the wires behind it brought nothing back to life - so it looks as though it must an earthing issue.
I knew that - just testing ... or just asleep. And whilst I am there I can check the ruddy grounds as well.
Stupid question #1: how will I know if the fuse is dead? Multi-meter and my electronics engineer?
There's actually a built-in fuse tester with a lamp on the fuse panel.
Hi Al
Check all fuses and clean them up as well as contacts in fuse box
Mine was damp with moisture and opv did not blow a fuse when i replaced it but still no rev counter etc
I cant remember fuses that are linked in but when i claened all fuses and holder everything was fine
Fitted old opv ralay and it was still u/s
Its been fine for 10k since i cleaned fuses and contacts
The earths were a bit scabby but all were down to ground 100%
Check fuses and clean contacts of all fuses
Use some fine wet and dry say 600 grit and a junior hacksaw blade or equivelent size piece of metal
Im sure all will be good
Dirty contacts equal high resistance and false readings when load is applied
Hi Al
Check all fuses and clean them up as well as contacts in fuse box
Mine was damp with moisture and opv did not blow a fuse when i replaced it but still no rev counter etc
I cant remember fuses that are linked in but when i claened all fuses and holder everything was fine
Fitted old opv ralay and it was still u/s
Its been fine for 10k since i cleaned fuses and contacts
The earths were a bit scabby but all were down to ground 100%
Check fuses and clean contacts of all fuses
Use some fine wet and dry say 600 grit and a junior hacksaw blade or equivelent size piece of metal
Im sure all will be good
Dirty contacts equal high resistance and false readings when load is applied
GWG - We will give it go! Thanks.
Guys - curious story:
OPV replaced with new variety (2 x 10amp fuses) which of course has redundant elements on a 91 463. No changes. Buckets of WD40 on all earth/ground points > no change. Then on a long drive the tach suddenly comes to life! Still no clock ... and god knows what the ABS is doing or not.
Have you tried checking the connections on the rear of the instrument binnacle? The connectors on the printed circuit boards are not the best and it could be a problem with bad contacts here. If your ABS is working, then OVP relay is fine. However, if your radio is also playing up. It might be a bad ignition switch. This provides power to the radio in position-1.
Have you tried checking the connections on the rear of the instrument binnacle? The connectors on the printed circuit boards are not the best and it could be a problem with bad contacts here. If your ABS is working, then OVP relay is fine. However, if your radio is also playing up. It might be a bad ignition switch. This provides power to the radio in position-1.
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Gav - the 460 has gone, the 463 300GDL is all that remains now. VIN 463-328.27075626