cd.thomson
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| posted on 5/7/10 at 02:15 PM |
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diodes
After a kind recommendation on my last thread with my endless foglight switch question, could anyone recommend a diode suitable for the below
application - and let me know if this is going to work (I know nothing about electrics).
 
Rescued attachment foglights.JPG
Craig
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Peteff
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| posted on 5/7/10 at 02:22 PM |
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Why does it need diodes for a single bulb foglight/rear hazard ? If you want the foglight/rear hazard to only work on dipped beam just run a wire
from the dip relay to the fog switch.
[Edited on 5/7/10 by Peteff]
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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eznfrank
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| posted on 5/7/10 at 02:25 PM |
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As above, if you look at the IVA manual there is a table of conditions which must apply. In all of them the fog is only on when the dipped is also on,
so just take a feed off that?
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cd.thomson
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| posted on 5/7/10 at 02:27 PM |
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its got to work on dip beam and full beam so I need the feed to the switch to be fed from both relays. It just shouldn't work on sidelights.
It appears the best I can get without diodes is for the switch to operate during dip and flash.
Craig
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Doofus
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| posted on 5/7/10 at 02:31 PM |
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Mine passed with the fog running off the side lights feed. The side lights stay on with dip and main tho.
Do yours?
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cd.thomson
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| posted on 5/7/10 at 02:33 PM |
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quote:
Originally posted by Doofus
Mine passed with the fog running off the side lights feed. The side lights stay on with dip and main tho.
Do yours?
This is how mine were originally set up and was a specific fail point.
Craig
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Doofus
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| posted on 5/7/10 at 02:38 PM |
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I do apologise... My column switch mechanically locks out the fog light switch so it only comes on with main or dip. Even though the feed is from the
side lights.
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cd.thomson
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| posted on 5/7/10 at 02:49 PM |
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if someone could advise on the questions ive posted I'd be very grateful.
This is basically the last thing keeping my car off the road and its getting a bit frustrating.
ETA: Ah, I see the problem now doofus, my switch is separate.
[Edited on 5/7/10 by cd.thomson]
Craig
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BenTyreman
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| posted on 5/7/10 at 02:52 PM |
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Your dip beam should stay on when the main beam comes on. Ergo, just feed the fog lamp switch from the output of the dip beam relay.
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cd.thomson
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| posted on 5/7/10 at 02:56 PM |
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quote:
Originally posted by BenTyreman
Your dip beam should stay on when the main beam comes on. Ergo, just feed the fog lamp switch from the output of the dip beam relay.
It does when I flash, but not when I switch to main beam. Is this a big issue because I've just fitted the original sierra switchgear/relays
along with a moderately massed produced kit car loom?
I have the growing fear that what appears to have been a small problem I can't fix is going to turn out to be a big problem I can't fix.
Craig
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BenTyreman
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| posted on 5/7/10 at 03:08 PM |
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A 25 watt fog lamp should draw around 2.1 amps. This is rated for 3 amps or
this is rated for 6 amps.
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Stott
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| posted on 5/7/10 at 03:12 PM |
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Yeah it will fail if it goes off with the main.
You must have the same stalks as me, (I have the sierra fusebox too) and when you hit main on, the dip relay feed switches off so I overcame it the
way you drew it above.
I did reccomend the diode too in my original post to you a few days back:
LINK to original question
Maplin UK59P cost about 80pence each
HTH
Stott
Oh and the main will come on with the dip in a 'flash' operation but the dip is switched off in 'main' operation to prevent
the filaments burning out in H4 bulbs, this is almost always the case. The exception is where the vehicle uses separate bulbs, say a H7 and a H3 which
can both remain lit when main beam is on.
[Edited on 5/7/10 by Stott]
[Edited on 5/7/10 by Stott]
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rallyingden
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| posted on 5/7/10 at 03:38 PM |
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Hope you can follow this ( using my phone to post )
-----DIP-------------->DIODE>---------|
---Main-------------->DIODE>----------|--------FOG SWITCH ----------FOG RELAY / LAMP----
RD 
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omega 24 v6
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| posted on 5/7/10 at 04:13 PM |
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Do it with a 5 pin relay.
Pin 86 earth
pin 85 main beam and linked onto pin 87
pin 87a to dip beam
pin 30 to fog light switch
job done - circuits kept seperate - and no diodes to blow
If it looks wrong it probably is wrong.
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snapper
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| posted on 5/7/10 at 04:44 PM |
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You will need to confirm with a real auto electrician but surelly a change over relay could feed from both dipped and main to the switch and then to
the fogs
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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omega 24 v6
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| posted on 5/7/10 at 04:46 PM |
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quote:
You will need to confirm with a real auto electrician but surelly a change over relay could feed from both dipped and main to the switch and then to
the fogs
What i just said No???
If it looks wrong it probably is wrong.
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snapper
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| posted on 5/7/10 at 04:54 PM |
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I posted from my phone in a dodgy area so my reply hit after you posted.
Yeah
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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omega 24 v6
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| posted on 5/7/10 at 04:59 PM |
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quote:
I posted from my phone in a dodgy area so my reply hit after you posted.
LOL dodgy area ( allsort in my mind now)
If it looks wrong it probably is wrong.
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matt_claydon
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| posted on 5/7/10 at 06:39 PM |
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As above - use a 5-pin relay, you don't want to be messing with diodes. Here's a diagram so you can see how it works:
 
Rescued attachment Fog relay.jpg
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