filter warning light

Post by **ianminor** » Mon Jul 06, 2009 8:29 pm

I have checked my filter warning circuit and it seems ok but the warning light fails to light when ign is switched on [bulb is ok]
Can the sender unit be replaced?

Post by **rayofleamington** » Mon Jul 06, 2009 8:34 pm

I've never tried to dig one out of the housing, but the bigger problem would be getting a new one to go back in.

My best guess would be to try and get a replacement filter housing. There should be some available from a scrap 1098...
I might even have one for you!

Post by **Matt** » Mon Jul 06, 2009 9:23 pm

Does your filter actually have the blockage sensor?

Post by **bmcecosse** » Mon Jul 06, 2009 9:44 pm

It's not supposed to light up when Ign on! It only lights up when the filter becomes blocked - and pressure rises across the filter! Test it by earthing the wire to the engine block - it's a normally open switch that closes on rising pressure. Opposite to the 'oil pressure' switch - which is normally closed - and opens on rising pressure.

Post by **mike.perry** » Mon Jul 06, 2009 10:00 pm

Only the later cars have filter warning lights and many of those have changed to cannister filters. The rest manage without one.
Best use for the light is to fit a towbar and use it for a trailer indicator warning light

Post by **rayofleamington** » Mon Jul 06, 2009 10:21 pm

It's not supposed to light up when Ign on!

He's right you know! Doh.

Post by **Declan_Burns** » Tue Jul 07, 2009 6:42 am

I use that too but as a reversing light indicator. I have a write-up on how to do it if anybody wants it. I can't upload a pdf file here and don't know if it's possible.
http://www.morrisminoroc.co.uk/index.ph ... 45473_6259[/img]

Post by **mike.perry** » Tue Jul 07, 2009 9:17 pm

Good idea but if the reversing light is operated by the gear change then it doesn't need a warning light

Post by **bmcecosse** » Tue Jul 07, 2009 9:20 pm

Oh now where's the fun in that?! The whole idea was to make good use of the spare warning light! If you fit a Mini speedo - you get a green light to play with too !!

Post by **Declan_Burns** » Tue Jul 07, 2009 9:26 pm

Mike,
The light on the speedo is parallel wired from the relay that switches the reversing light on. It's just an acknowledgement light indicating that the system is working and not as such a warning light.

Post by **ianminor** » Wed Jul 08, 2009 7:32 pm

well guys, thanks for all the replies. this forum is wonderfull, I got the answer to my problem and a wealth of other info too. It's just great!

Post by **bmcecosse** » Thu Jul 09, 2009 1:46 pm

We aim to please!

Morris Minor Owners Club

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filter warning light

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