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Author Auto Electric question
Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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14th Feb 12 at 19:02   View Garage View User's Profile U2U Member Reply With Quote
trying to find what i need to ensure the current only flows one way down a wire, needs to be suitable for +ve 12v 25mps

think i need some sort of diode but no idea what, any help?
22B
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14th Feb 12 at 19:05   View User's Profile U2U Member Reply With Quote
zener diode is what your after I believe
22B
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14th Feb 12 at 19:12   View User's Profile U2U Member Reply With Quote
good site here for calculating what rating you need

http://www.reuk.co.uk/Zener-Diode-Voltage-Regulator.htm
Steve
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14th Feb 12 at 19:14   View Garage View User's Profile U2U Member Reply With Quote
loads of 12v type things eg

http://www.ebay.co.uk/itm/1N5349B-5W-ZENER-DIODE-12V-Pack-4-1N5349-/300571135984?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item45fb6f8ff0

but it looks too small, im guessing it wont take the current

i think i need 300watts but cant find one that high
22B
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14th Feb 12 at 19:19   View User's Profile U2U Member Reply With Quote
What is it exactly you are trying to make? you will probably need resistors aswell as a diode
Gary
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14th Feb 12 at 19:23   View Garage View User's Profile U2U Member Reply With Quote
What could you possibly need to do that for?
Steve
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14th Feb 12 at 19:24   View Garage View User's Profile U2U Member Reply With Quote
my fan override switch has a lamp on it that illuminates when switched.

the problem is if the vehicle kicks the fan on then the light will illuminate even if the override switch is off because the current will flow back up the override wire.

its not a mega problem in fact i think it could be a benefit as it would show if my fan was on regardless
Gary
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14th Feb 12 at 19:29   View Garage View User's Profile U2U Member Reply With Quote
Use a relay between the switch and fan. Job done.
Mertin
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14th Feb 12 at 19:31   View User's Profile U2U Member Reply With Quote
Would just have to have a position indicator on the switch so you knew if it was auto or if you had put it on (incase you forget)

Was about to ask what if you have the fan on and then it automatically kicks in but that shouldnt happen
Gary
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14th Feb 12 at 19:36   View Garage View User's Profile U2U Member Reply With Quote
Also where is the live taken from to the switch?

Relay would also make it possible to switch an ignition live meaning you cant leave the fan on with the ignition off
Steve
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14th Feb 12 at 19:40   View Garage View User's Profile U2U Member Reply With Quote
will be labelled with a position so i will know
Gary
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14th Feb 12 at 19:43   View Garage View User's Profile U2U Member Reply With Quote
Where is the live taken from to the switch?
Steve
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14th Feb 12 at 19:50   View Garage View User's Profile U2U Member Reply With Quote
12v ignition, its a permanent live
Gary
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14th Feb 12 at 20:06   View Garage View User's Profile U2U Member Reply With Quote
Then to where? Puma have a relay or just phat cable from the batt to fan switch like corsa?
Gary
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14th Feb 12 at 20:07   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Steve
12v ignition, its a permanent live


Thaats a contradiction too,
John
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14th Feb 12 at 20:08   View User's Profile U2U Member Reply With Quote
http://www.ebay.co.uk/itm/Blocking-Diode-30A-Schottky-Wind-Generator-Solar-Panel-/280821555471?pt=UK_Gadgets&hash=item416244e10f#ht_1074wt_1270
Ian
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14th Feb 12 at 20:11   View Garage View User's Profile U2U Member Reply With Quote
300W at 12v is 25A.

Might also be worth replacing the switch for a double pole and running the tell tale off the other pole.
Steve
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14th Feb 12 at 20:13   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Gary
quote:
Originally posted by Steve
12v ignition, its a permanent live


Thaats a contradiction too,


12v to the ignition switch probably makes more sense
Gary
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14th Feb 12 at 20:14   View Garage View User's Profile U2U Member Reply With Quote
Yeah
Gary
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14th Feb 12 at 20:27   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Gary
Then to where? Puma have a relay or just phat cable from the batt to fan switch like corsa?
bigron1988
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14th Feb 12 at 20:50   View User's Profile U2U Member Reply With Quote
just run it of a relay like i have on mine
Steve
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14th Feb 12 at 20:52   View Garage View User's Profile U2U Member Reply With Quote
then straight to live on the fan, relay is possibility, just trying to reduce the wiring a bit, that diode john posted might do the job

[Edited on 14-02-2012 by Steve]
bigron1988
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14th Feb 12 at 20:55   View User's Profile U2U Member Reply With Quote
yep straight to live on fan
Ian
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14th Feb 12 at 21:03   View Garage View User's Profile U2U Member Reply With Quote
DP switch like I suggested a while ago
Gary
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14th Feb 12 at 21:04   View Garage View User's Profile U2U Member Reply With Quote
Use the diode. It'll make you look clever on your puma forum.

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