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Voltage sensitive switch [relay]


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#1 western

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Posted 31 May 2012 - 08:18 PM

Do any of you know if there is a fairly easy way to test the Voltage Sensitive Switch [VSS] relay off the vehicle ?
it's the yellow one that hides in the far right corner of a 90/110 dash [PRC4427 or AMR3325]

I need to check the 2 I have, because I.m not sure if these are working properly, there is 12v feed on the brown wire & continuity on the black & black/slate wires, it's not allowing my split charge relay to operate.

found this schematic of the subject VSS.

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#2 nickwilliams

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Posted 31 May 2012 - 09:09 PM

Very easy to do if you have a variable output bench power supply, tricky if you don't. I've got one - you can post them to me and I'll test them if you like.

NIck.

#3 western

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Posted 31 May 2012 - 09:16 PM

Cheers for the offer Nick, I believe the electricians at work [aircraft engineering] have a suitable variable output bench tester, I'll check tomorrow, but if my workmates can't do it, then I'll be in contact.

as for the split charge it has a different earth path now & it is charging the winch battery,but would prefer to use the VSS to control it as LR intended.
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#4 TSD

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Posted 31 May 2012 - 09:50 PM

Oi, Western. If you're going to nick stuff off my website, at least give me the credit ;)
I spent literally minutes reverse engineering that!

#5 western

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Posted 31 May 2012 - 09:54 PM

Oi, Western. If you're going to nick stuff off my website, at least give me the credit ;)
I spent literally minutes reverse engineering that!


I found it via another thread on another forum, didn't realise it was yours, 

Thanks very much to TSD :i-m_so_happy: for coming up with the diagram in my question above


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#6 TSD

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Posted 31 May 2012 - 09:59 PM

Now you know who drew it, you should know better than to trust it too. Get it checked by an adult is my advice :blush:

#7 western

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Posted 01 June 2012 - 01:38 PM

took a printed copy to work,my workmates both a/c electricians/avionics said it was OK, we tested the VSS with a bench variable output power supply & it didn't allow any output on terminal 4 until the feed in was around 14.8 to 15 volts, so the first of my VSS is duff.

will be testing the currently fitted VSS on Weds & see what that does.
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#8 western

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Posted 06 June 2012 - 06:01 PM

right today, we checked the 2nd VSS part AMR3325, the unit operates on a rising voltage to 13 volts, BUT when it's in the vehicle, it's not allowing the split charge relay to operate. 2nd battery is currently at 12.08v so the system should be charging it when engine is running/driving.

I've redone a continuity test on the black/slate wires from split charge connection to the VSS socket which was all good & the brown wire at VSS socket gives me 12v also the green wire [from fusebox ign controlled] at split charge relay has 12v when tested.

next option is to replace the VSS with a new one & see what happens then, system has been working fine up until a few days ago.

don't know where or what else to check.

if split charge relay is given a different earth path it works fine but it's not controlled by the VSS.

would it be worth adding a switch in the earth path & switch it in manually when the 2nd battery needs charging. I would prefer to VSS to do it though.
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#9 Buzza

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Posted 07 June 2012 - 12:22 PM

Your probably aware but just a thought, you will have continuity through one strand of wire, but it won't have much current carrying capacity. Could it be a wire chaffed partly through or corroded ?

Steve

#10 western

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Posted 07 June 2012 - 08:34 PM

it's a new loom from autosparks, fitted it myself very carefully a few years ago, the VSS just won't let the split charge power up, there's one wire I haven't tested, thats a tomorrow or Saturday job when it's not blowing 60mph plus winds & rain.
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#11 western

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Posted 09 June 2012 - 01:43 PM

solved the fault :i-m_so_happy:

I had the 2nd battery out of the 110 for a long recharge over a weekend, must have missed :wacko: reconnecting the VSS brown 12v feed wire, traced it to battery bay & spotted it lying on the floor, so VSS had no way to determine if it should operate or not, reconnected the brown & VSS & split charge working as it should, thank god that job is finished. :i-m_so_happy:
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#12 western

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Posted 30 June 2012 - 01:18 PM

a bit of useful info I've learnt today, the later version of the Voltage Senstive Switch is

AMR3325 -- No longer available

but the earlier version PRC4427 is still available form Brit-car.http://www.brit-car....php?xProd=89705
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#13 zardos

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Posted 30 June 2012 - 01:28 PM

Yes but have you seen the price :o

#14 western

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Posted 30 June 2012 - 02:49 PM

Yes, it's not a cheap part. but if anyone wants the system work work as designed, I don't think there's another option.
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#15 zardos

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Posted 30 June 2012 - 03:13 PM

There are a few on ebay cheaper

#16 western

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Posted 30 June 2012 - 03:23 PM

There are a few on ebay cheaper


I know, but I would much prefer a new one.
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#17 TSD

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Posted 30 June 2012 - 04:22 PM

The circuit is very cheap and simple, and all the parts are easily available. Can't you find someone to fix your duff one?

#18 western

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Posted 30 June 2012 - 06:43 PM

possibly if I knew which bit was duff & what to buy, would the 8 leg black chip need reprogramming ?
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#19 PaulMc

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Posted 30 June 2012 - 07:58 PM

a bit of useful info I've learnt today, the later version of the Voltage Senstive Switch is

AMR3325 -- No longer available

but the earlier version PRC4427 is still available form Brit-car.http://www.brit-car....php?xProd=89705




I happened across this one the other day -

STC61888 SWITCH RELAY LIGHTING TOMB RAIDER DEF

£54.04 (+ £10.81 VAT in EU)

http://www.brit-car....hp?xProd=103436

Posted Image


I wonder how this one differs to PRC4427 and AMR3225

.
Paul.
1989 Arles Blue 2.5TD 110 Hardtop
1999 Epsom Green Discovery II 4.0 V8i 'XS'

#20 western

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Posted 30 June 2012 - 08:05 PM

never knew that existed till now,
to late for me as I've got the PRC4427 on it's way to me, I know this will fit & work, as it is the original unit in my '89 110.
I don't think Brit-car know it's a similar item either as they weren't aware that PRC4427 is the same as AMR325, until I asked about it.

the parts info http://www.numcat.ru...ver/p/31/53684/ item 12 says it's a switch lighting not a VSS. Very strange, wonder why it's used on the tomb radier vehicles.


Edited by western, 23 March 2013 - 06:44 PM.

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