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PostPosted: Sat Jun 27, 2020 2:13 pm 
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Joined: Thu May 31, 2018 9:52 pm
Posts: 27
Car Models: 900
Hi everyone - hoping someone can help on an annoying fuse blowing issue in my 85 900.

The cigarette lighter has been working, and reversing lights, for 2 years but recently stopped, 20A fuse was blown so tried a replacement.

As soon as the ignition was on it heated up and blew.

Image20200627_131753

I took a look at the cigarette lighter socket and it was pretty dirty and abused, so I cleaned out the gunk, scraped,sanded a few contacts and trioed another fuse... blew again straight away (nothing is plugged in, I should add.

Image20200627_133319

So I pulled the dash buttons out and disconnected the cigarette lighter entirely....same thing again!

Image20200627_140200

I looked up a few old threads and it appears on this year the reversing lights are on the same circuit - I took out the lenses and checked the bulbs are all ok, no burn marks or obvious corroded contacts.

Could it be the reversing light switch by the gear stick? Or is this just a bad earth somewhere that required tracking down?

Any tips very welcome indeed...


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PostPosted: Sat Jun 27, 2020 2:33 pm 
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Joined: Tue Aug 04, 2015 12:18 am
Posts: 113
Location: Scotland
Car Models: 900
Do you have a multimeter?


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PostPosted: Sat Jun 27, 2020 2:44 pm 
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Joined: Thu May 31, 2018 9:52 pm
Posts: 27
Car Models: 900
Yes indeed - 12V at the fuse but from then I'm a little stumped...!


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PostPosted: Sat Jun 27, 2020 4:16 pm 
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Full Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 638
Location: Leicestershire
Car Models: 1992 900i, 1984 T16S “Snufkin”
Well you've eliminated the ciggy lighter for now, so that's progress...
See if this helps:
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Attachment:
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IMG_1687.jpg [ 105.04 KiB | Viewed 196 times ]


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PostPosted: Sun Jun 28, 2020 9:13 pm 
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Joined: Tue Aug 04, 2015 12:18 am
Posts: 113
Location: Scotland
Car Models: 900
Leave fuse out and check for a short circuit, on the cig lighter wiring too, can't rule that circuit out yet.


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PostPosted: Wed Jul 01, 2020 10:31 am 
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Joined: Thu May 31, 2018 9:52 pm
Posts: 27
Car Models: 900
Thanks all - I am awaiting a new pack of fuses and some time to look into it further, but the earthing point for the rear lights look all ok.

The wiring in this car is a real mess in general - previously an 'enthusiast owned' which unfortunately translates to all sorts of bodgery and strangeness to be removed.

I'm erring on the side of this being a short too.

If I put in a fuse and turn on the ignition in neutral, will that rule out the reversing light circuit? I realise I have been turning it on with the gear in reverse, and as it takes ~10 secs for a fuse to blow that may be why it survived this long if we only reverse occasionally.

Thanks again all.


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PostPosted: Wed Jul 01, 2020 10:39 am 
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Full Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 638
Location: Leicestershire
Car Models: 1992 900i, 1984 T16S “Snufkin”
Spinakerr wrote:
The wiring in this car is a real mess in general - previously an 'enthusiast owned' which unfortunately translates to all sorts of bodgery and strangeness to be removed.

I know what that is like - just had to remove a tow bar, aerial, alarm (with wiring just pushed into connectors), homemade 3rd brake light and LED taillight bulbs..
If you find any scotchloks.... :wall:
The only thing I know about electrics is this: If it doesn't work - that's power: if it doesn't work properly, that's earth.


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PostPosted: Wed Jul 01, 2020 11:52 am 
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Joined: Tue Aug 04, 2015 12:18 am
Posts: 113
Location: Scotland
Car Models: 900
Continuity check every wire to ground, save blowing fuses :wink:


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PostPosted: Wed Jul 01, 2020 4:38 pm 
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Joined: Thu May 31, 2018 9:52 pm
Posts: 27
Car Models: 900
This was the radio - check out the unicorn intestines...

Image20200501_112447

...and the mysterious light blue wire soldered into the red (and green?) of the radio went to the... heated rear screen...

Image20200627_140200

Absolutely terrifying.


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PostPosted: Wed Jul 01, 2020 5:03 pm 
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Joined: Tue Aug 04, 2015 12:18 am
Posts: 113
Location: Scotland
Car Models: 900
Give up, why is the radio wired to the heated rear screen? :shock:


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PostPosted: Wed Jul 01, 2020 5:04 pm 
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Joined: Thu May 31, 2018 9:52 pm
Posts: 27
Car Models: 900
When I figure it out, I'll let you know! hopefully just a 'spare' live was required...

If I reconnect it and the fuse for the lighter stops blowing I'm goign to throw in the towel!


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PostPosted: Wed Jul 01, 2020 5:09 pm 
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Full Pressure Turbo

Joined: Mon Aug 22, 2016 11:23 am
Posts: 638
Location: Leicestershire
Car Models: 1992 900i, 1984 T16S “Snufkin”
^^^ If that happens that’s the troll all Saab’s have messin’ with ya mind...


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