Ignition not cranking the engine (only click is heard at starter)

[Yarb]

Could be the neutral safety switch or the relay. I converted mine to manual and jumped the wires at the trans harness. If you find you need a relay I possibly still have mine if you can’t find one.

[MH77280Z]

12 minutes ago, Yarb said:

Could be the neutral safety switch or the relay. I converted mine to manual and jumped the wires at the trans harness. If you find you need a relay I possibly still have mine if you can’t find one.

Let me bypass the neutral safety switch first and see if it changes anything. Appreciate your generous offer to help.

Edited February 4 by MH77280Z

[Zed Head]

I had assumed a manual.  Didn't notice the A/T in the signature.  Shame on me.

There's actually a relay and and a switch in the starter circuit.  The relay is one of those two function relays, connected to the inhibitor switch.  So, there's three possibilities there - a bad relay, a bad inhibitor switch, or a bad inhibitor switch actuation.  I don't understand how the Inhibitor Switch works, but I think CO and SteveJ do.  Might be that there's a seat belt switch that actuates the Inhibitor Switch which then actuates the Starter Relay allowing the starter to function.

So, I think you need to consider all of these or just find that wire from the ignition switch and bypass all of it.  

Notice the M at the bottom, completely bypassing the A/T safety devices.  Funny, because the manuals do not have a clutch or neutral safety switch.  You can start them in gear.

 

[Zed Head]

 

[Zed Head]

[MH77280Z]

1 hour ago, Zed Head said:

When i turn the key to ON without the seat belt inserted, i hear a beep. With the seat belt harness connected no beep. Can I assume the seat belt relay is working?

 

[Zed Head]

Something that the electrical guys might be able to explain - does this diagram not show power from a fusible link passing through two normally closed relays to a realu coil then to ground?  Can't be right, right?

[Zed Head]

I don't know why Nissan calls that relay a Seat Belt relay.  Hard to tell by the wiring diagrams.  Looks like the seat belt buzzer has its own circuit.

They show the "driver's belt switch" here but not in the starting diagrams above.  Confusing.

[Zed Head]

But they do show the belt switch wires as two green wires, which correlate with the two greens at the inhibitor switch.  So, if the buzzer works then stops then the inhibitor is probably getting its power too.

Your problem is probably in the ignition relay or the starter seat belt relay, if jumping the inhibitor doesn't work.

[Zed Head]

[Zed Head]

One is under the voltage regulator in the engine bay (I think that they're trying to show the oil filter in the background in their drawing ,with the bracket unbolted so that it can be reached), the other is by the fuse box in the cabin.

[Patcon]

Even if a relay closes that doesn't mean the contacts are passing power or don't have high resistance