11AC outputs

jasper53

Member
Anyone got any info as to what voltage is supposed to be coming from the warning light wire on the 11AC? Alternator not that old and is charging fine. Having bother with the warning light and most Jag sources say the voltage should be around 7.5 volts at the 3AW brown/yellow terminal with engine at around 1500rpm. We only have 1.2v at about 2500rpm. checked with a meter to earth at the alternator end and at the termination of the 3AW. Think the 3AW relay will need more than that to function? Any ideas very welcome.
 
According to the ROVER P6 manual it looks as though a minimum of 6V needed to extinguish the warning light and it should stay on at 2V or lower. I haven't got the internal wiring of the alternator which might point to your problem. You say its charging fine , what is the charging voltage?
 
Hi, thanks for that. Showing 14.6 at fast idle 1500rpm. If it stays on at 2v that would explain the light being on. Don't understand why the thing is charging though. Must be doing something as we were out at the weekend with lights and wipers on for around 80 miles without a problem. Battery still showing full charge on discharge meter and car starts as normal. Maybe time to fit an ACR? Cheers, Rob
 
Not really that bothered about the charge light really, just good to know if you have lost the fan belt!! We'll figure it out one way or the other.
 
I wonder if you could fit a voltage sensitive relay used for battery charging on caravans etc which would be wired to extinguish the light when the voltage rises as the alternator kicks in . They are wired to close the contacts as the voltage rises but with a bit of thought it could be done.
 
Have a box full of relays we use for modelling, with ratings from 6v. Could easily wire one of these in to earth the light, which is all the 3AW does, if in fact that is the problem. If the input is too small it won't work anyway. Problem is we can't figure out why we only have 1.2v out of the warning light terminal on the alternator. Going to take it to bits and check for anything hanging off inside after the next show we are off to.
 
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