fuse therapy session....

[Trevor Irwin]

When I do the testlamp diagnostic, sometimes the wrong wires (which I have
coming out of the diagnostic connectors) accidentally  touch. This
will blow fuse 21.

trevor

On Thu, 30 Aug 2001 johnholt at sympatico.ca wrote:

> 1990 Canadian Coupe Q 20v (with inoperative air conditioning but that MAY
> not be relevant).
> 
> Bentley and Owner's manual says - Fuse 18 should be for rear windshield
> wiper and power mirrors including heated mirrors. Fuse 21 is for
> diagnostics.
> 
> 
> Real life - Rear windshield wiper and power mirrors including heated
> mirrors is not fused on fuse number 18 but rather fuse 17 with fresh air
> blower and air conditioner. In theory, I don't need fuse 18. No apparent
> screwing around with circuits by PO.
> 
> .....and fuse 21 blows with regularity.
> 
> 
> Condition - When fuse 18 is inserted, the air conditioning control head
> remains in "on" position with red indicator light at whatever setting prior
> to key key being removed and blower operating despite the fact that the key
> is removed and the owner has walked (guaranteed dead battery syndrome).
> 
> Removal of the fuse 18 kills the "on" problem and the air blower/ac head
> acts normal and turns off with key. No unusual problems in diagnostics.
> When fuse 18 is re-inserted and key is turned on, the ac head problems
> return. If key is turned on and fuse 18 is then removed, I hear a
> switch-off sound around mid to passenger side of engine. Haven't found the
> sound yet (compressor???)
> 
> 
> Logical Solution - remove the number 18 fuse and life is normal.
> 
> I can't accept that and so before I dig further, does anyone have any
> insight into the purpose of fuse 18 and/or why the diagnostics fuse 21
> constantly blows.
> 
> 
> Appreciate some help. TIA
> 
> John.....
> 
> 
>