Electrical fault

[nzspokes]

Im working on a Honda with an electrical fault. Its for the high beam. Ive traced it back to when the high beam is selected that power feed drops to .5v. Rest of the time the feed is showing about .5v less than the rest of the system. Being a Hornet Im working on most of the plugs are behind the headlight and i have checked and cleaned them. Also the dash lights have stopped working. The highbeam works fine on the passing switch which is feed by a different power feed.

Am I right in thinking its either a crap earth somewhere or a break in that power feed?

[bogan]

We could have a better guess with a bit more information. By feed do you mean voltage across the bulb? from battery earth to fusebox? across the switch? etc...

[AllanB]

Dash lights will most likely be a bulb or two or four. High frequency vibration can kill em. I replaced a few when I had mine.


Some years back I read on Wrist Twister the exact same headlight issue. Can't remember specifics of fixing it but my gut recall was a strip and clean of the headlight switch block. Worth a look - if it is dusty in there a good blow out with a can of compressed air and tidy up of contacts may fix it.

[nzspokes]

We could have a better guess with a bit more information. By feed do you mean voltage across the bulb? from battery earth to fusebox? across the switch? etc...

Power feed at the high beam switch. Pulled the switch apart and cleaned it. Couldnt work out why It showed a voltage then when turned on it drops away.

[bogan]

Power feed at the high beam switch. Pulled the switch apart and cleaned it. Couldnt work out why It showed a voltage then when turned on it drops away.

So where are you getting the ground from? The switches I've seen just switch the positive supply to the filaments.

[nzspokes]

So where are you getting the ground from? The switches I've seen just switch the positive supply to the filaments.

Ground is on the ground for the indicators which are working well. Just remembered an on Hornet issue with the headlight wiring going through the starter switch. Means when it gets dirty you get no power to the headlight. Will go check that now.

[bogan]

Ground is on the ground for the indicators which are working well. Just remembered an on Hornet issue with the headlight wiring going through the starter switch. Means when it gets dirty you get no power to the headlight. Will go check that now.

Check the voltage from the battery ground too. Mixing your measurements across different circuits is bad practice as it can easily mask the problem.

The best tests to start with, are measure voltage from high beam pin (closest to headlight) back the the battery +ve, and -ve. Then headlight ground back to the battery +ve and -ve as well.

[nzspokes]

Fixed. Crap in the starter switch.

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