Triumph Repair: Alternator conversion ACR16 to ACR17 connections, jumper wire, brown wires

Question
I have fitted an ACR 17 (36A) as a replacement for my ACR16 Lucas alternatoron the 1970 TR6.
The ACR 16 was 5 terminals. The ACR 17 is 3 terminal and there appears to be no resistence between the two large terminals. Can you advise how to make the wiring harness connections. I have TR6 manual for reference.

Thanks
Peter

Answer
Hi Peter,

Remove one of the battery cables.

The three connections on the new alternator are two large spades and one small spade. Unlike the old alternator both large spades are (+) all the time. The one small spade is the trigger sensor which should come from the charge light (Ign light)

Connect the large brown w/white tracer wire from the ammeter to either of the large spades. Remove the connector block with the two brown wires and the one brown w/red tracer wire. Discard the brown w/red wire. Connect the two brown wires together on a single large spade connector and connect it to the second large spade on the alternator.

Cut the brown w/yellow jumper wire off(shown in your diagram) but keep the single brown w/yellow wire from the charge light (Ign light) and plug it on the small spade on the alternator.

Put a 12v test light between the undone battery cable and the battery post. It should not light the test light. If it does do not connect the battery cable, something is wrong or you have some accessory turned on. If the test light does not light up you can connect the battery cable. Then remove the small spade brown w/yellow wire from the alternator and put your test light between it and ground and the light should not light up. Then turn the ignition key to ignition and the test light should light dimly. If it does turn the key off and connect the wire back on to the alternator and note that the IGN light is off and turn the key to ignition again and the IGN light should light up brightly.

Then put a volt meter across the battery posts and read battery voltage (12.5+ volts) then leave the volt meter on the battery and start the engine and set it on fast idle (about 1500 RPM) and read the volt meter. (13.8 to 14.5 v. and the IGN light should be out)

Howard

Howard