So I took my dash partially out of my 73 240z to replace my heater hoses. I’ve since replaced the hoses and put the dash back. Now my car won’t crank. When I turn the key, the fuel pump runs and the relay on the passenger side floor clicks as normal but no crank. Any ideas?

2 hours ago, nahurry said:

So I took my dash partially out of my 73 240z to replace my heater hoses. I’ve since replaced the hoses and put the dash back. Now my car won’t crank. When I turn the key, the fuel pump runs and the relay on the passenger side floor clicks as normal but no crank. Any ideas?

Do you have power to anything when the key is in ACC or ON?

Have you checked for voltage at the black/yellow wire for the starter solenoid when someone is holding the key in START?

Start there and tell us what you find.

I’ll check tomorrow, thanks

.65 at the bottom lug and 12 volts on the top lug

Edited July 5Jul 5 by nahurry

1 minute ago, nahurry said:

.65 at the bottom lug and 12 volts on the top lug

You need to add more detail. When, and exactly where? There are three "lugs". Actually two lugs and a spade. SteveJ is asking about the spade (black and yellow wire). With the key at Start.

The 12 is a good sign though.

As @Zed Head said, pull the spayed ign. Off the terminal and measure the voltage. Black to Gand and red on the spade turn the key to start.

11.26 volts

21 minutes ago, nahurry said:

11.26 volts

Meaningless

as @Zed Head said, pull the spayed ign. Off the terminal and measure the voltage. Black to Gand and red on the spade turn the key to start.

2 hours ago, nahurry said:

11.26 volts

I think that he's just answering Yarb's question directly.

Seems like you're getting voltage/current to the starter solenoid.

Leave the wire off of the spade terminal on the starter and use a jumper wire or a tool like a screwdriver to connect the main battery connection to the spade on the solenoid. You can also run a longer wire directly from the battery positive for convenience. The starter should actuate. If it doesn't then the solenoid contact has probably crapped out. There will be some small sparks and the starter will work correctly otherwise. Make sure the car is in neutral and nobody has their fingers or other things by the fan belt.

If you hear a solid click from the solenoid but the starter motor does not spin that's a sign that the starter motor has failed. Yout starter looks pretty crusty.

If you try this jumper wire method and everything works then you have a problem with the wire from the ignition switch.