Need help in fitting a relay for an auxiliary battery,what colour wire ?

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I am fitting a relay for an aux battery,I have pulled the connector off of the alternator and I have 2 wires:

Blue/white
Red/white

Without pulling off the dashboard can anyone tell me what one of the two goes to the ignition light Unknw

Its a Hijet 1997 pick up cb42 engine.

Alternator Wires.

One wire should be live all the time, that would be the Feed Wire.(To/From Battery)

The other should only come live with the ignition on. (From Charge Light)

(I haven't tried this, so you MAY find both live only with ignition on?)

Regards

Sarah

Regards

Sarah