I think something is not connected

Andy515666 · Post by **Andy515666** » Mon Nov 12, 2007 8:40 pm

Hi everyone...

I have a SD1 se2 and its been my project car for a very long time! New motor, maual gearbox, new suspension, brakes etc etc.. however my dash does not work now.

the speedo and rev counter do but the temp, oil and fuel are all non-responsive,. The oil pressure light is on but that cannot be correct.

Is there a central point for these gauges where i may have unclipped something?

cheers
andy

Post by **katanaman** » Mon Nov 12, 2007 8:48 pm

I dont know these cars at all but a lot of the smiths instruments have a central voltage regulator on them. I would have a dig around for that and make sure its ok.

This is just a shot in the dark so wait and see if someone else comes up with anything more specific.

Post by **Coops** » Mon Nov 12, 2007 9:08 pm

Im suprised Ramon has not replied yet, as he is very familiar with these cars etc.

Post by **katanaman** » Mon Nov 12, 2007 9:56 pm

probably in the pub instead of writing VB scripts like me, lucky bugger!!!

Post by **Coops** » Mon Nov 12, 2007 9:58 pm

Andy515666 · Post by **Andy515666** » Mon Nov 12, 2007 11:04 pm

katanaman wrote:probably in the pub instead of writing VB scripts like me, lucky bugger!!!

Wish i was at the pub!!!!

ramon alban · Post by **ramon alban** » Mon Nov 12, 2007 11:23 pm

thev8kid wrote:Im suprised Ramon has not replied yet, as he is very familiar with these cars etc.

Gosh Tony, can't an old codger watch a Stephen Poliakof play on TV without being missed (after which I fell asleep over me 'orlicks)?

Anyway, Marki, if it were just the voltage regulator then it would affect only the temp and fuel gauges, not the oil pressure gauge.

So, Andy, because you've lost nearly everything on that side, something more basic is either fuse B3 blown or the connector feeding the green wire from the fuse to the instruments is loose. See here for the 1985 version, otherwise find the same cct diagram for your model in haynes or wkshp manual

http://www.vintagemodelairplane.com/pag ... uit01.html

Post by **katanaman** » Mon Nov 12, 2007 11:30 pm

Like I said not sure of the car so it could have been an electronic oil gauge which would have a regulator.

Anyway glad you made it out the pub

surprised they sell orlicks there mind you

Andy515666 · Post by **Andy515666** » Mon Nov 12, 2007 11:30 pm

ramon alban wrote:
thev8kid wrote:Im suprised Ramon has not replied yet, as he is very familiar with these cars etc.
Gosh Tony, can't an old codger watch a Stephen Poliakof play on TV without being missed (after which I fell asleep over me 'orlicks)?

Anyway, Marki, if it were just the voltage regulator then it would affect only the temp and fuel gauges, not the oil pressure gauge.

So, Andy, because you've lost nearly everything on that side, something more basic is either fuse B3 blown or the connector feeding the green wire from the fuse to the instruments is loose. See here for the 1985 version, otherwise find the same cct diagram for your model in haynes or wkshp manual

http://www.vintagemodelairplane.com/pag ... uit01.html

Hi Ramon

Thanks for the info. WHen i was looking at my haynes manual.. well I just get lost on the first page of wiring ha ha

no but seriously, cheers, i will go have a play round tonight and probably start with the fuse.

Andy

Post by **Coops** » Mon Nov 12, 2007 11:34 pm

ramon alban wrote:
thev8kid wrote:Im suprised Ramon has not replied yet, as he is very familiar with these cars etc.
Gosh Tony, can't an old codger watch a Stephen Poliakof play on TV without being missed (after which I fell asleep over me 'orlicks)?

Anyway, Marki, if it were just the voltage regulator then it would affect only the temp and fuel gauges, not the oil pressure gauge.

So, Andy, because you've lost nearly everything on that side, something more basic is either fuse B3 blown or the connector feeding the green wire from the fuse to the instruments is loose. See here for the 1985 version, otherwise find the same cct diagram for your model in haynes or wkshp manual

http://www.vintagemodelairplane.com/pag ... uit01.html

i watched it too

but i never had orlicks mine was a stella

ChrisJC · Post by **ChrisJC** » Tue Nov 13, 2007 8:18 am

If the oil light is always on (I assume the engine is running), and also assuming that there is oil pressure!, then it must just be the sender.

The circuit for that is pretty straightforward. If the light is on, then there must be power to that cct.

Unless of course the wiring is mixed up somehow and the oil light ain't connected to the oil light sender.

Chris.

ramon alban · Post by **ramon alban** » Tue Nov 13, 2007 10:29 am

ChrisJC wrote:If the oil light is always on (I assume the engine is running), and also assuming that there is oil pressure!, then it must just be the sender.

The circuit for that is pretty straightforward. If the light is on, then there must be power to that cct.

Unless of course the wiring is mixed up somehow and the oil light ain't connected to the oil light sender.

Chris.

And in which case the power is getting to the circuits but the oil light on means the gauge read zero and we come back to the voltage stabilizer that is preventing the other two gauges from reading, in which case Andy, it is one of the tin can units about the size of two sugar cubes plugged into the back of the cct board. Marki knows you know!

Wierd tho'? to have two faults on the same area at the same time.

Andy515666 · Post by **Andy515666** » Wed Nov 14, 2007 3:37 am

Ramon, cheers for that I had a look at the link and printe off the mapping.

Also i have just remembered that the trip metere is not working either.. So would this be all on the same fuse or power supply?

Will have a squizz tonight

ramon alban · Post by **ramon alban** » Wed Nov 14, 2007 10:40 am

Andy515666 wrote:Also i have just remembered that the trip metere is not working either.. So would this be all on the same fuse or power supply?

Gosh Marki! Help!

Andy Bro, now we have three things not working Two power feeds to the TC and Interface (if Efi car) unit (J1 and J3) are from the fuse B3 as mentioned earlier and also probably via the same connectors.
There is another power feed to the TC - J4 on fuse C3, so lots of possibilities for the computer crash.

Perhaps you need to do a fuse/connector check for the whole instrument area, before proceeding?

This type of thing:

http://www.vintagemodelairplane.com/pag ... ing01.html

Post by **katanaman** » Wed Nov 14, 2007 5:47 pm

Hmmm as said I don't know the car but when multiple things start acting up or going odd I always start to think earthing problems. Generally there is a lot less earth's/grounds than there are power feeds. One earth dropped can lead to several circuits not working or doing strange things even though they are different fused circuits. Does this sound plausible?