Jigsaw- electrical issues before I admit defeat ***SOLVED***

pvr said:
I can follow the thinking, but that would mean that it triggers a relay to provide the main circuit to the wipers and you would hear the audible relay click from that.

To continue thinking that way - Stuart, do you hear an unrelated relay switch at the time of roof opening?

Yep- the two purple ‘roof’ relays buzz rather than click
 
bigwinn said:
pvr said:
I can follow the thinking, but that would mean that it triggers a relay to provide the main circuit to the wipers and you would hear the audible relay click from that.

To continue thinking that way - Stuart, do you hear an unrelated relay switch at the time of roof opening?

Yep- the two purple ‘roof’ relays buzz rather than click

That is interesting, we have relays in our products and I can replicate that issue when the (tiny) pulse signal voltage difference is not sufficient to keep the magnet energised, hence buzzing. That would imply a low voltage at the input side, which tallies up with what Rob mentioned about a leak voltafe of 2Volt as that is not sufficient to energise the relay but would make it buzz like mad.
 
I’ve looked at the numbers on each fuse as Rob said

Some high in the region of 1000, some low around 025, but fuse 32 is the one that went straight to 1

1-
2-
3 1000
4 1050
5 1155
6 025
7 025
8 023
9 025
10 976
11 1100
12 895
13 900
14 900
15 1150
16 1200
17-
18-
19 1124
20 1250
21 023
22 023
23 024
24 965
25 024
26 988
27 1000
28 976
29 989
30 900
31 978
32 1
33 010
34-
35-
36 1050
37 1000
38 1045
39 1230
40 1140
41 1100
42 1050
43 1060
44 025
45 1020
46 1000
47 1000
48 1000
49 1000
50 1000
54-60 1000
 
Interestingly Steve and I were perusing the TIS diagrams to spot any commonality with the faults

Although we couldn’t see the wiper linking up, we did spot that the roof and the central display connectors are in the same location near the roof motor behind the seat

Going to have a look there today to see if any wire chafing issues

The central display has been tested on Steve’s car and works perfectly
 
bigwinn said:
I’ve looked at the numbers on each fuse as Rob said

Some high in the region of 1000, some low around 025, but fuse 32 is the one that went straight to 1

1-
2-
3 1000
4 1050
5 1155
6 025
7 025
8 023
9 025
10 976
11 1100
12 895
13 900
14 900
15 1150
16 1200
17-
18-
19 1124
20 1250
21 023
22 023
23 024
24 965
25 024
26 988
27 1000
28 976
29 989
30 900
31 978
32 1
33 010
34-
35-
36 1050
37 1000
38 1045
39 1230
40 1140
41 1100
42 1050
43 1060
44 025
45 1020
46 1000
47 1000
48 1000
49 1000
50 1000
54-60 1000

You now need to compare those numbers to your coupe. You really need a roadster but your coupe is better than nothing :thumbsup:

On my multimeter 1 is no connection and 000 is a perfect uninterrupted connection. This shown on mine by touching the red and black probes together.
 
Final final roll of the dice was to swap the fuse panel out. For £15 from eBay it was worth it for the spare fuses and relays alone!

Went to swap over today and noticed 2x additional relays in slot 6 and 9. Now up to this point I’ve not noticed anything affected by those not working (fog lights work and not needed to use rear demister)

Fuse panel swapped over- no change to the electrical issues. Sod it.

But

Car won’t start??!!

Swapped the old panel back- starts fine?

So that confused me

But nonetheless the electrical issues are still present.

It’s off for an MOT next week which it will fail due to the wipers not working. But then I can leave it with the garage who specialise in electrical diagnosis and hopefully get it resolved

Stuart
 
bigwinn said:
Yeah. See I knew I shouldn’t ask

:poke: :rofl:
Well Stuart, fingers crossed after so much time and effort. I can’t believe you have put it back together so quickly. Good luck. 👍👍👍
 
Solved!

It was a loose earth- x490 under the drivers dash side.

Disappointed that is on me- but next time I’ll know!

Stuart
 
Surely this deserves a bit more than just a quick update? I was expecting a bit of drama and suspense in revealing the cause :poke:
 
bigwinn said:
Solved!

It was a loose earth- x490 under the drivers dash side.

Disappointed that is on me- but next time I’ll know!

Stuart
Great news Stuart. I knew you would do it. When is it going for an MOT?👍👍👍👍👍👍
 
bigwinn said:
Solved!

It was a loose earth- x490 under the drivers dash side.

Disappointed that is on me- but next time I’ll know!

Stuart
Angela says have a gold star and go to the top of the class.👏👏👏👏👏👏
 
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