75 amp fuse keeps popping

[ChrisS13]

Evening all.

Bit of fun and games with the car tonight

The 75amp fuse in the engine bay box, popped on me tonight. A few electrical parts still work, no lights or indicators ect, but the car will still try and start, turns over okay, no spark it seems.

This I think is the immobiliser, as the light on the dash has gone out entirely..?

Before it went, the car would start and run fine for a few seconds, but then stalled, even with throttle applied.

So a little reading before this post reveals that that 75 amp fuse mainly governs the alternator..? Which I guess would explain the car stalling after a few seconds..?


I've recently moved the battery to the boot, and have checked, as best I can in the dark, all the earths, in the both the boot and the engine bay. A proper look tomorrow in the light might shed some light on the matter, but if anyone has any ideas, it could be helpful.

After I'd checked all my connections I tried an 80amp maxi fuse with connectors, just to see, and it blew it sky high as soon as it was connected. Key wasn't even in the ignition at this point.

The car drove fine until tonight. Even a short (like three minute) drive to the girlfriends house, moments before this issue raised its ugly head.

Any help?

Thanks folks.

[VIDAL BABBOON]

Is your car low ?

Was it wet when this started ?

Only instances i have heard like this is when the loom in the driver side front arch has been worn through.

[ChrisS13]

Hi mate. Yep quite low, but having rubbed through most of it in September, its all been repaired and moved well out the way. Ive had a quick look at it anyway, but can't see much with the wheel on in the dark...

[joedmt]

Sounds like something is going to earth. Check the cable running to the boot isn't damaged on the insulation anywhere and touching the body as that could cause problems.

[joedmt]

Also what size cable have you used?

[ianlea73]

Sounds like something is going to earth. Check the cable running to the boot isn't damaged on the insulation anywhere and touching the body as that could cause problems.

This for sure.

[ChrisS13]

Thanks team, heading over to it now to have a look at resolving this.

Also what size cable have you used?

16mm² bud.

[ChrisS13]

All sorted Turned out to be a little LED strip I was using to light up a switch panel. No idea how it was managing to pop that fuse, it was wired up to the plug with three wires that isn't plugged into anything... has a 'sidelights on' 12v feed...

I know not to use it again.

Thanks for everyone's input!