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Torbayboy
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12v electrics
« on: Jul 9th, 2021, 1:33pm »
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Need some help, had fans shorting on the motor and had rewired from a seperate feed and all seemed well cutting in and out as the temp went up etc, and after having leccy man to check the problems below are not associated with this work Smiley
 
Car starts drives ok no heater as fans etc dead no front and rear screen heaters or lights on switches for them no clock no air con no interior lights,
 
 fuse 17 (7.5a) blown and blows again on replacing, have had a small problem with door open light, due to switch in door,seems the car has a "bad spot" somewhere behind the dash engine loom Ok and back loom OK accoring to checks today.
 
Car left a week battery flat, previously last week it started and ran after left 4 days, needle flick after starting (probbaly due to fuse 17 blowing as has this before) lights wipers radio horn indicators fogs etc all working as is horn.
 
Require pointers, suggestions (not that sort!! Shocked) and help to get this sorted.
 Thanks for reading
 
 Grin Grin Grin Grin Grin Grin
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Tompion
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1997 2.3 Ultima estate.

   
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Re: 12v electrics
« Reply #1 on: Jul 10th, 2021, 10:03am »
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Are you saying a problem with one door and interior lights or all doors.
There have been problems with the plastic of the interior lights breaking allowing the live to short to earth but don't know if it would cause fuse 17 to blow. you could try pulling relay 5 (interior lights) - wrongly listed as rear screen in the handbook.
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Torbayboy
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Re: 12v electrics
« Reply #2 on: Jul 10th, 2021, 10:57am »
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To clarify all interior lights do not light, the drivers door always shows open on the dash, and having queried this in the past it is Led driven, not bulb as in the granada so will not ruin the dash display. The car has functioned with this error for over a year now, and the switch in the door is hard to get at so it has been "lived with).
 
 Wink
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Tompion
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Re: 12v electrics
« Reply #3 on: Jul 12th, 2021, 1:05pm »
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Roy
 
The wiring diagrams aren’t always correct but had a look through – not easy as info scattered all over the place Smiley
It lists F17 as supplying:
Instrument interface control
Diagnostic system
Charging system
(also engine control on the diesel)
 
So presumably blown F17 is why the battery is running down.
It shows a splice somewhere behind the instrument cluster & the wire to the cluster as Orange/Blue.
Coming out of the cluster as White/Black, shown as .5 – so thin wires. For the 12v it then goes through connector C2521 & remains as White/Black heading for the alternator.
 
Connector C2521 is shown as a 6 pin connector – 2 rows of 3 pins and says it’s located in the engine compartment rear right hand side. If you can't see it you'll have to trace back from the alternator.
Try disconnecting it and see if the fuse still blows & you’ll know which side to look for the problem.
As I say the diagrams aren’t always right – there could be other items supplied by this fuse.
 
Dave
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Torbayboy
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Re: 12v electrics
« Reply #4 on: Jul 12th, 2021, 4:36pm »
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Thanks, when it stops raining will ahve a look at that,
 
Have a spare 2 litre on the drive with most of the dash out will see if we can trace there before we shred his estate.
 
  Roll Eyes
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Re: 12v electrics
« Reply #5 on: Jul 14th, 2021, 6:37pm »
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It could be the alternator at fault so try disconnecting that if the connector C2521 isn't easy to find.
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Torbayboy
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Re: 12v electrics
« Reply #6 on: Jul 23rd, 2021, 3:02pm »
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OK so today after the rain had the blistering sun, that furnace has now gone also, so we go scorpio fixing Grin
 
Removed relay 5 as you mention (yellow one with base left behind) and replace fuse 17 with a 10a one, it blows Sad
 
Car starts OK 2 times while we try this , but an old problem surfaces.. try to start -- nothing no light on dash no click sweet fanny  adams, so old fix check terminals on battery and just for good luck press down on drivers side fuse  box bridge link, as normal all that was functioning now functions, had this several times when car was new to us but havent seen it for along time now.
 
Same things not working heeater and controls f & r screens heaters and button lights, interior lights, but radio works ('95 tiny model one) heater doors half open so it's nice and warm, fans that caused it all still workin fine cutting in and out, h lights, winkers et c and horn OK.
 
 Haven't disconnected the alternator -yet.
 
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Re: 12v electrics
« Reply #7 on: Jul 25th, 2021, 7:58pm »
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Not a good idea to use a bigger fuse, as mentioned it's a thin wire - you run the risk of melting it.
Assuming the diagrams are correct, ignore my first post, disconnecting the alternator is the first thing I'd try.
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