Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Electrical gremlins related to ignition light
petroldiaries

posted on 19/3/18 at 06:52 PM Reply With Quote
Electrical gremlins related to ignition light

I hit some electrical gremlins in Episode 7 of my Westfield restore diary (See link below). I'm fitting replacement LED dash lights as the old ones have seen better days, also I'm fitting new switches as these have started to discolour and are showing signs of corrosion on the back. I've been contacted by someone whose recommend I check the ignition switch as he's seen similar engine running down issues when jiggling the wires, anyone else seen similar?

https://youtu.be/B12DvmgrSSs


If anyone can make use of a full set of old switches let me know, free to anyone who wants on here.

View User's Profile View All Posts By User U2U Member
petroldiaries

posted on 19/3/18 at 07:00 PM Reply With Quote
It probably helps if I post a picture;o)


View User's Profile View All Posts By User U2U Member
CosKev3

posted on 19/3/18 at 07:03 PM Reply With Quote
Just be aware you will need to do some extra fiddling about with the wiring if you intend to use a LED instead of a filament bulb for the ignition light
View User's Profile View All Posts By User U2U Member
petroldiaries

posted on 19/3/18 at 07:07 PM Reply With Quote
quote:
Originally posted by CosKev3
Just be aware you will need to do some extra fiddling about with the wiring if you intend to use a LED instead of a filament bulb for the ignition light


Erm ok I just assumed i could do a like for like swap, is there more to it?

View User's Profile View All Posts By User U2U Member
daviep

posted on 19/3/18 at 07:36 PM Reply With Quote
quote:
Originally posted by petroldiaries
quote:
Originally posted by CosKev3
Just be aware you will need to do some extra fiddling about with the wiring if you intend to use a LED instead of a filament bulb for the ignition light


Erm ok I just assumed i could do a like for like swap, is there more to it?


Charging circuit may not work with LED installed instead of filament bulb, LED may not draw enough current through the alternator excitation circuit to start charging process. You can install an additional hidden bulb or resistor to make it work properly.





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member
big_wasa

posted on 19/3/18 at 07:49 PM Reply With Quote
You could treat your self to a bright 6 display.
View User's Profile View All Posts By User U2U Member
starterman

posted on 19/3/18 at 08:08 PM Reply With Quote
Daviep is right in what he says about an LED ignition light not working. Put a resistor in the line and it will be ok.

Cheers
Mike

View User's Profile View All Posts By User U2U Member
petroldiaries

posted on 19/3/18 at 08:58 PM Reply With Quote
Wow thanks for the great advice guys, glad I posted on here otherwise could have been chasing my tail again.
View User's Profile View All Posts By User U2U Member
CosKev3

posted on 19/3/18 at 09:19 PM Reply With Quote
Yeah as above ref exitation,your new alternator would not be charging with just a LED warning light
View User's Profile View All Posts By User U2U Member
gremlin1234

posted on 19/3/18 at 09:34 PM Reply With Quote
quote:
Originally posted by starterman
Daviep is right in what he says about an LED ignition light not working. Put a resistor in the line and it will be ok.

Cheers
Mike
the resister should be in parallel not series (I am sure you know that, but to make it explicit for others ;-)

other thing to note, led's are 'directional' ie have pos and neg, filament bulbs don't care

edit sp

[Edited on 19/3/18 by gremlin1234]

View User's Profile View All Posts By User U2U Member
petroldiaries

posted on 19/3/18 at 09:35 PM Reply With Quote
quote:
Originally posted by CosKev3
Yeah as above ref exitation,your new alternator would not be charging with just a LED warning light


Cheers mate!!! I like the hidden bulb idea

View User's Profile View All Posts By User U2U Member
daviep

posted on 21/3/18 at 07:37 PM Reply With Quote
quote:
Originally posted by gremlin1234
quote:
Originally posted by starterman
Daviep is right in what he says about an LED ignition light not working. Put a resistor in the line and it will be ok.

Cheers
Mike
the resister should be in parallel not series (I am sure you know that, but to make it explicit for others ;-)

[Edited on 19/3/18 by gremlin1234]


TBH I have never given it any thought, what's the reason it must be in parallel? Off the top of my head I can't think why it makes any difference.

Cheers
Davie





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member
starterman

posted on 21/3/18 at 08:18 PM Reply With Quote
quote:
Originally posted by gremlin1234
quote:
Originally posted by starterman
Daviep is right in what he says about an LED ignition light not working. Put a resistor in the line and it will be ok.

Cheers
Mike
the resister should be in parallel not series (I am sure you know that, but to make it explicit for others ;-)

other thing to note, led's are 'directional' ie have pos and neg, filament bulbs don't care

edit sp

[Edited on 19/3/18 by gremlin1234]


Just so happens I know about stuff like that, I have been known to repair the odd 20 or 30 alternators and associated stuff a week lol

View User's Profile View All Posts By User U2U Member
daviep

posted on 21/3/18 at 08:41 PM Reply With Quote
I'm not doubting you, I wanted to know the actual technical reason to increase my understanding.

Cheers
Davie





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member
gremlin1234

posted on 21/3/18 at 09:51 PM Reply With Quote
quote:
Originally posted by daviep


TBH I have never given it any thought, what's the reason it must be in parallel? Off the top of my head I can't think why it makes any difference.

Cheers
Davie
the alternator requires a reasonably small current though the circuit.
a 2.4W 12V bulb is 200mA
led, with is resistor < 10mA
in series these two would only pass the led current. (actually a tiny fraction less, but negligibly so ) ~5mA
in parallel, the current would be the two added together ~ 205mA

View User's Profile View All Posts By User U2U Member
daviep

posted on 21/3/18 at 10:47 PM Reply With Quote
Thanks, that makes perfect sense I was having a complete brain fart, obviously the resistor in series reduces the current when in fact we are trying to increase it.

Much apppreciated
Davie





A truly great library contains something in it to offend everyone.

View User's Profile E-Mail User View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.