Fuse melting engine cuts out - help please

two clarion round speakers in the kick panels have been going strong since at least 1997
I've put 4 x rear speakers under the bench seat - even with two there is no need for a sub - plenty of base

 

Cheers.
Back to the regular scheduled programming!

 

No it is a well needed distraction

My stereo is all on a leisure circuit with separate fuses

 

On further investigation I think shed loads of stuff runs through that big red wire going to fuse 9!
Main lights, Indicators, G & Oil lights, fuel gauge, immobiliser, immobiliser on off light.

This is how I checked, as i may have reached the wrong conclusion.

Big red wire in top terminal 9 (fused). Engine not running. Pull fuse: Main lights go off, indicator off, G& Oil lights off, fuel gauge off. Side lights stay on

The same Big red wire put in bottom lower terminal 9 (unfused). Engine not running. Pull fuse: Everything stays on!

Smaller red wire bottom upper terminal 9 (unfused). Remove wire. Lights stay on, front indicators still work.


Don't know whether this will make finding the issue easier or harder.

 

Cheers Ian. I'll have a read now

 

Pulling out fuse or wire?..or both?

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I've read it now, interesting and many similarities with my situation.
My red & white wire does seem to go into the unfused bit, but its on fuse 8 a far as i can tell.
Pic to follow

My understanding is improving slightly, but its still well beyond me!

 

I'm talking about the same big red wire moved to test in two positions

I pulled the fuse for the big red wire 'test' (in the top fused) terminal
I pulled the fuse for the big red wire test (in the bottom unfused) terminal


I pulled the wire for the smaller wire test (in the bottom upper unfused) terminal

 

Makes sense to me. If you put the supply to all the ignition switched fuses through a fuse then pull the fuse they stop working.
If you put that supply direct to the ignition switch pulling the fuse has no effect on anything other than the horn and some light or other...the things fuse 9 is supposed to protect.

 

Fuse 8 and 9 are joined at the unfused end so in reality they serve as a mini busbar as well as supplying the fuses. At that end it doesn't matter which wire is on which, they are both the same thing.

 

But haven't i discovered some extra items are on fuse 9 that aren't usually? Main headlights etc

 

They are only supplied through 9 as well as their correct fuses when it's wired wrong.

 

Yes so the lights etc shouldn't even be going through fuse 9

 

Exactly, nor anything else that only works with the ignition on - the wipers for instance, another big load. Wipers and headlights together even worse.

Using the headlight for example, I think one headlight is on fuse 2 and only works with the ignition on.

The circuit wired wrong is battery - fuse 9 - ignition switch - fuse 2 - headlight.

Wired correctly with the bottom of fuses 8 and 9 merely being a connector for the ignition switch supply, the circuit is battery - ignition switch - fuse 2 - headlight.

 

No just proved your big red wire goes to the ignition..

When put in bottom didn't go through fuse so pulling it would only knock out internal light.. main lights get a feed via the ignition nd relay here too

When put in top ignition supply goes though fuse first so pulling the fuse cuts that supply off... including supply to the lights and coil and everything else but keepsbconnection to little red wire



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Imagine it as a tree.
The ground is battery +ve
The sky is battery -ve
The individually fused branches feed the leaves.
Wired wrong you had an extra fuse in the trunk.

 

Do you think the small red wire is something to do with the immobiliser?
@paulcalf does the small red wire look original?

 

small red wire looks original and goes from unfused 9 to relays

 

Small red from fused side of 8/9 normally overhead lights, one via a dash switch, one via door switch. Shouldn't need to go via relays but m8gjt go past them on the way to the doors?

I'd guess there's an always live wire to immobiliser but it could get that by intercepting the ignition feed., and not passing it on if not activated.

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Did I mention that I hate electrickery ??

Give it to a man who can - he may find issues you're making worse ...

Just my tuppenceworth...

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