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{snip} I assume that the relay is changing the impedance of the circuit
well it did work! I have used a NPN transistor 500mA IC current, a 2k7 load resistor on the base side and a 20V .5A diode across the relay for protection, the battery charge light stay put, and my circuit working.
thanks
quite correct I used a 1n4001F and the transistor look ok so far, I haven't try to disconnect the alternator as there are 5 wires so you don't prove any thing but I have re connected the alternator directly and the same thing hapen, the transistor is not so fast so I don't think the back EMF will go more than 20V