steve m
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| posted on 10/12/09 at 08:13 PM |
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Charge light query
with a dashboard charge light, should it be wired from the alternator and from the and the plus side of the battery ?
ive rewired my car, and seemed to of cocked up the charging light ??
regards
steve
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02GF74
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| posted on 10/12/09 at 08:25 PM |
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that is correct.
one side of lamp goes to switched 12 V and other to alternator.
note that this is not the main alternator output but the charge lamp terminal. (for wnt of a better description).
if your lamp is a LED, then it can only be wired one way; for a filamnet bulb it does not matter.
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blakep82
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| posted on 10/12/09 at 08:47 PM |
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will an LED lamp have any problems lighting up properly. what with the alternator 'exciting' itself etc, will there be any issue with the
tiny amount of current needed?
reason why i ask is because i got a starter button with led light, i want this to light up when the engine's not running, and go off when it is
(like the battery light)
i also want a battery light too, so will both wired in be a problem?
sorry to hijack 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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steve m
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| posted on 10/12/09 at 08:57 PM |
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Thanks guys, i thought i was right but it didnt work, so will look at tomorrow
regards
steve
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britishtrident
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| posted on 10/12/09 at 09:23 PM |
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Wire the LED up via the oil pressure switch.[
quote]Originally posted by blakep82
will an LED lamp have any problems lighting up properly. what with the alternator 'exciting' itself etc, will there be any issue with the
tiny amount of current needed?
reason why i ask is because i got a starter button with led light, i want this to light up when the engine's not running, and go off when it is
(like the battery light)
i also want a battery light too, so will both wired in be a problem?
sorry to hijack
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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blakep82
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| posted on 10/12/09 at 09:29 PM |
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^ ah, good call! hadn't thought of that
cheers 
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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daviep
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| posted on 11/12/09 at 08:58 AM |
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An LED may not pull enough current to excite the alternator.
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Land Locked
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| posted on 13/12/09 at 07:32 PM |
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quote:
Originally posted by daviep
An LED may not pull enough current to excite the alternator.
LED on it's own will not pull enough current.
This layout will. It's a modified copy of a diagram that someone on the South African Locost forum found. I did the mods based on my own
experience with some stationary engine controllers.
The 100 Ohm resistor at 2 W gets VERY hot. 5W is a minimum. The 1n4007 can be any 1 amp diode, it stops back feed.
[Edited on 13/12/09 by Land Locked]
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MikeRJ
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| posted on 13/12/09 at 08:18 PM |
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Not convinced the diode is really needed in the above; there should be no back feeding from the alternator. If there were then it would cause
problems with a conventional filament lamp as well.
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