I found one fuse under the dash which tested good. Is there a main fuse somewhere else that I need to check?

I agree with Tinys advice-change the fuse and and check one at a time and inline for continuity. All the current should flow thru the ammeter . Check it for continuity not voltage . 

Posted by: @buckaroo01-2-2-2-2

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I found one fuse under the dash which tested good. Is there a main fuse somewhere else that I need to check?

The wiring diagram shows a fuse block somewhere. I don't know where it would be located. 

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A bad fuse would not keep the starter from working

Sorry I’m late responding. I think John mentioned that the negative battery cable was connected to the car frame. On 41-48 cars, including the wood wagons, the braided ground strap was connected to a tapped hole in the bell housing directly above the snout on the starter. Here are a couple pictures, hope they help.

I like for my ground cable to attach to a bolt on the engine or transmission. I assume you have removed and cleaned both ends of both cables. As stated before, there is no fuse that would prevent the starter from working. Keep testing and good luck.

Mike

I checked the voltage at the starter from the positive cable and the ground at an engine bolt and I get 6.45 v. Still the starter won’t crank over. Any ideas?

I would check the switch next. Disconnect the battery ground and then remove the positive cable from the starter. Take the two screws out and look it over. The switch contacts and the copper lug on the starter should be bright. Post a picture if you can. New switches are available and the lugs can be cleaned if not too burnt.

Is there a smaller wire on the switch lug with the cable?

Yes there is a smaller wire on the switch lug that goes thru the firewall

@buckaroo01-2-2-2-2 You say you checked the ground at an engine bolt. That is not the same as having the ground cable anchored at an engine or transmission bolt. Have you removed the cables and cleaned both ends of each of them? Have you cleaned the locations where they attach to the starter and ground?

Mike

John please advise if you have made any progress. 

I had minor surgery yesterday so I’m not able to do much for a couple days. What I don’t understand is I don’t have any electrical, gauges, headlights, taillights all don’t work. I have 6.45v from negative battery post to the positive end of cable at the starter.

I would say that it has to be the wire that is on the starter post that goes in to th amp gauge, that’s the one that send the voltage to all stuff that’s not working.

Does the starter work now?

No the starter doesn’t work.  This started after I went out and got some gas. After fueling the starter was weak with the battery. The car stalled in the driveway and I was unable to get it started, the battery couldn’t turn the starter over. I bought a new battery and now nothing works. The car is stuck in reverse gear