Driver side high beam

[portafilter]

Hi all
Does anyone have any idea why my driver side high beam fuse would keep popping. it takes about 3-4 seconds so I don't think it's a full short but it's fully annoying. So far ive changed bulb and fuse brand. I thought I had fixed it last week but blew again today on first night run. When it was going it was only pulling about 5a about std for a std H4 on high. it's a Puma.
Cheers. Justin.

[Bearman]

Bad earth?

[JDNSW]

Best guess is an intermittent short, probably somewhere along the harness running along the top of the inner mudguard where the insulation has rubbed through, probably against a sharp corner.

John

[superquag]

Have a close (magnifying glass) look at the edges of the blown fuse. A short-circuit will burn or explode the metal and give a wide gap. Overloads tend to melt and part less violently.
Old-fashioned glass-tube fuses show the differances better than the plastic blade-types.

See above, look for a shrted wire somewhere, insulation j-u-s-t worn thru enough to barely make contact.... which is why it takes a few seconds to happen.
- A good contact would pop the fuse instantly.

[portafilter]

thanks again team.
where the loom pops out of the firewall and into the engine bay it runs through a plug and down past the ABS pump/controller into the wheel arch. turns out its been rubbed through by the vibration of the pump hence the intermittent nature of it. it needed a little shake to short to earth. also fount the larger loom rubbed through as well, might be something to look at on all Pumas. i now have a couple of polished flat spots on the hight pressure tubes coming out of the ABS unit. in the last pic you can see the grey bit on the pump body that has been rubbed by the wires in basically the centre of the shot.