Thread: Aux circuit - Intermittent issue

Hi, the aux relay's earth is common with the ABS pump and SLS compressor relay's so if it was that you should get the 3 amigos and SLS warning(if fitted) once it's missing, you should replace the fusebox with a known good one cos it's very suspect... as long as you hear/feel the relay clicking but no power to auxiliay circuits and the relay was ruled out the problem is on the power feed from FL7 to the relay's contact, when you turn ignition on from cold and the aux power is missing remove FL7 and insert a piece of wire instead and if the power comes on it can be a hairline crack in it or bad contact there.

Originally Posted by sierrafery

Hi, the aux relay's earth is common with the ABS pump and SLS compressor relay's so if it was that you should get the 3 amigos and SLS warning(if fitted)

Cheers mate.

I do have another issue where the TC nor HDC lights illuminate - I feel seperate to this issue.

The ABS is always on due to the front LH ABS sensor failing (currently replacing that now as we speak).

Originally Posted by sierrafery

you should replace the fusebox with a known good one cos it's very suspect... as long as you hear/feel the relay clicking but no power to auxiliay circuits and the relay was ruled out the problem is on the power feed from FL7 to the relay's contact, when you turn ignition on from cold and the aux power is missing remove FL7 and insert a piece of wire instead and if the power comes on it can be a hairline crack in it or bad contact there.

Thanks mate, I'll have a looksie.

Originally Posted by sierrafery

as long as you hear/feel the relay clicking but no power to auxiliay circuits and the relay was ruled out the problem is on the power feed from FL7 to the relay's contact, when you turn ignition on from cold and the aux power is missing remove FL7 and insert a piece of wire instead and if the power comes on it can be a hairline crack in it or bad contact there.

The issue is that power does eventually come on to the aux circuit, albeit rather intermittent. That makes me think that the fusebox is fine.

Originally Posted by getLuke

The issue is that power does eventually come on to the aux circuit, albeit rather intermittent. That makes me think that the fusebox is fine.

Intermittent = bad contact somewhere and as long as the relay is clicking and no power to some aux circuits means that the power doesnt get to them or it's an earth issue as you suspected if it's common for all, the aux relay is feeding the heated screen, headlamp power wash and front fog lamps too through the engine bay's fusebox's internal circuit so see if those are working when the radio and others dont cos these are getting power through the interior fusebox which gets it from the other fusebox if you see what i mean, if the fog lamps are working while the radio, cigar lighter and wipers are not check earth header C0018 cos there's the common earth for these(the one which has only black wires in it)