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        General >> Problems >> massive current draw - air con relay
        
(Message started by: manscorpio on Apr 23^rd, 2006, 10:27am)

Title: massive current draw - air con relay
Post by manscorpio on Apr 23^rd, 2006, 10:27am

I have '96 cosworth estate auto and unless I remove the brown air con relay the generator light comes on. I have just fitted the generator (to cure the the perceived problem). I think there must be short circuit in the loom, anyone experience similar problem? Grateful for any ideas. By the way, with relay installed, air con is fine.

Title: Re: massive current draw - air con relay
Post by sector-9 on Apr 23^rd, 2006, 12:41pm

Erm, the air-con relay should be blue or green (assuming you are talking about R24 in the battery fusebox). I'm not being picky but there is a difference; basically the relay needs to have a terminal marked 87a (not just 87 as the brown ones have). The purpose of this relay is to cut power to the compressor at full throttle. Also check that there is a short link in positions 1 & 0 of B9.

No idea about the alternator warning lamp, but as you've guessed, the wiring for the compressor and alternator both run together in the same loom, so you will need to check the loom between the alternator and fusebox (it runs through the bulkhead then branches off and out again into the fusebox). It could be water ingress in the fusebox as apparently this causes all manner of strange electrical faults - but I don't think the wire for the warning lamp goes into this fusebox...

Darren

Title: Re: massive current draw - air con relay
Post by manscorpio on Apr 23^rd, 2006, 5:31pm

Darren

Thanks for your input; I am away from the car at the moment but on Tuesday I will be able to investigate further and obtain the the true facts.

Title: Re: massive current draw - air con relay
Post by manscorpio on Apr 26^th, 2006, 8:54pm

Darren
You are quite right. The brown relay that I have removed is apparently for the Engine Management System ! The other brown one (for the self-levelling suspension) is not present either. The car appears to run OK with the brown relay out ; but perhaps it is'nt.
What is the relay for on the EMS, I wonder?
Unfortunately I have to go off to Spain for the weekend, urgent course-work (golf that is) and will not be back till Monday.