Technical model A won't start

When I depress the starter floor button the starter turns over once then I lose all electrical.
The stater and solenoid were replaced 4 years ago.
Any ideas what's happening?

 

Model As don't have solenoids

 

Clean the battery terminals

 

Start with the basics.
Check compression.
Check spark.
Check timing.
Check for fuel at the carb.
If everything is in good form, you don't even need the starter.
www.youtube.com/watch?v=8EWDRHC2dzg

 

What he says plus check that the connection at the starter is clean and tight, also check the battery voltage and see how far it drops when you hit the starter.

 

Model A with a solenoid? I second the "clean your battery terminals". Take the cables off and clean the insides, not just the outsides. Battery post, too. When bright & shiny clean, wipe a thin coat of grease on the cable insides and the battery posts. That will help prevent corrosion. Check the cable connections at the starter and the ground for rust or looseness, etc. Clean, shiny and tight contacts make happy cars. Or just get out the crank..........

 

OK I may have misnamed the contact on top of the starter that when depressed it makes contact with the starter to start. What ever that is called it is relatively new and appears to be clean.
Plugs are new, battery terminals are clean, it's getting fuel.
Why would timing or compression make me lose electricals?

 

Model A won't turn over.....has it been setting awhile? Do the headlights go out when it quits cranking?
Will it turn over 360 degrees with the hand crank with the spark plugs in? With the spark plugs out
If the head gasket is leaking....you could have hydrolocked

 

I call it a switch

 

A great application for testing with a voltmeter. First you need to see that happens to battery voltage at the posts when the starter quits. If it stays near 6 volts, you have a connection problem. If it drops below 4.5 volts, I'd suspect a bad or discharged battery.

 

The ENTIRE STARTING CIRCUIT is
Battery
Battery cables and connections
Starter floor switch
That is everything involved in cranking.
If you come on here and ask us to diagnose what's wrong with that, I will assume that you need to look over everything.
Also, when someone asks about cranking, I assume they want to start the vehicle. That's why you want everything to be checked and working. Then you can try hand cranking to avoid diagnosing the cranking until the rest is good.

 

Make sure you have a GOOD ground. Model A's ground strap mounts to the crossmember. I always add an extra cable to the engine bellhousing just for an extra measure.

 

Pull the sparkplugs and hit the starter, if using the stock gravity feed and leaking or open petcock to carb, might be fuel in the cylinders.