Sparking problem

[Nickl911]

And yet more confusion...

Tracing the white coil + lead connectivity back to the brown wires at the battery (disconnected) positive terminal is not a good idea if your car doesn't follow the wiring diagram you have in your hand

With mine, it has been modified to feed the ignition fuse and ignition coil through one of the main relays. What this does is to electrically connect the coil wire with three (or six) other fuses which control other bits. One of these other bits just happens to be the hazard warning switch, and if this is accidentally left in the on position then a route exists from the coil wire to the battery and shows 45 ohms.

So any ohm readings while tracing connectivity and looking for high resistance problems are immaterial because the ignition coil will be fed directly via one of the relays when the ignition is on.

This doesn't match my wiring diagram so it is a case of starting from first principles.

The relays (5 pin instead of 4) also seem to be wired backward to the diagram i.e. 85 and 86 swapped and 30 and 87 swapped. This doesn't make any difference (I think) but just makes it hard to trace wiring.

I will say that the relay connections needed a good roughing up, and whether the internal resistance will affect the voltage at the coil I couldn't say. Maybe new relays will solve the problem.

I am now looking at a ohm reading of 1.1 between the coil wire and the two brown wires (off the battery). This is present even when the ignition is off, so confused. I think I'll give up on this until I have to address it later.

None of this helps the OP - sorry.

[adam quantrill]

So @Bigfish, it's all running now?

I take it this is with the same observations of coil voltage as before?

If so, we can conclude that:

- the wedge will spark fine with some voltage feed drop in the supply, and
- the engine will run "sweet", and
- it won't catch fire either.

[Bigfish_74]

Adam, yes in my opinion the drop in voltage wasn't causing the original spark problem, it now reads 11v under load, had a great run yesterday and all fine and no fires yet.
As an aside I did lose it again last week it seemed to be flooding after running for short periods. Changed plugs and all good again, so looks like plugs deteriorated quite quickly probably lots of overfuelling while solving the problems.
Enjoying the wedge at last!

[Penelope Stopit]

Where did the missing volt and fractions of a volt go?

Anyone find any missing volts lying around somewhere?

Strange thing is that some of the posters aren't regular posters and haven't been back since

This whole topic is full of mysteries, it's spooky

[Penelope Stopit]

adam quantrill said:

So @Bigfish, it's all running now?
I take it this is with the same observations of coil voltage as before?

If so, we can conclude that:

- the wedge will spark fine with some voltage feed drop in the supply, and
- the engine will run "sweet", and
- it won't catch fire either.

Hadn't read this

adam quantrill said:

the wedge will spark fine with some voltage feed drop in the supply

The wedge will run at its best with a maximum voltage spark, achieved by having no volt-drop at the coil supply

adam quantrill said:

the engine will run "sweet"

The engine will run sweeter with a maximum voltage spark (sweeter includes power and fuel consumption)

adam quantrill said:

it won't catch fire either

Takes a brave person to state a vehicle won't catch fire due to overheating connectors, where there's a volt-drop there's heat

Not wishing to hurt your feelings, you are wrong with every above comment

The thing is, you're too switched on to be getting it all so wrong, it's a mystery, it's spooky