Is there a wiring diagram for the Terminal Box? I had to take mine apart a few months ago and now I’m trying to recall how it goes together. Fortunately the wires have their ‘memory’ and that will help, but just wanted to be sure. How do I keep the wires tight and connected? I assume the nuts on the inside of the box has something to do with it?
Terminal Box
- Thread starter CatMan1
- Start date
Canton_Model_A's
Senior Member
Hopefully this image helps you out:
Attachments
Bruce of MN
Well-known member
Another one https://www.santaanitaas.org/wp-content/uploads/2014/08/Electrical.pdf
Without a good Model A wiring diagram, it is quite a handicap to work on electrical items.
Without a good Model A wiring diagram, it is quite a handicap to work on electrical items.
Cat, do you have the red book? If you don't you should get it.
https://www.snydersantiqueauto.com/product.htm?pid=980031&cat=41621
https://www.snydersantiqueauto.com/product.htm?pid=980031&cat=41621
nkaminar
Well-known member
Cat Man, Here are some tricks. Make sure the connection parts are shinny. You can use a brass wire brush. Use some electrical grease on the connections. You can find this in your local auto parts store or hardware store. The grease keeps oxygen and moisture from getting in there and corroding the connection. The connector goes between the fixed nut and the exterior nut. Do not over tighten so that you strip the treads. Just a firm tightening.
Colorado kid
Junior Member
If putting new junction box on, be sure the back of brass bolts are recessed to prevent grounding to the body.
I do have the red book, but it just wasn’t clear to me.
I assume that the internal nuts need to be spun out towards the front of the car sone to ensure a good connection?
Keith True
Well-known member
No,the two internal nuts make the connection.The outside wing nuts do nothing but hold the cover on,they have nothing to do with the connectionsThousands of Model A's were driven around with lost/broken covers.The cover just keeps the elements and oil out.
I wish I’d taken a picture of this before I pulled the wires. I only have one internal nut on each post. Surely there must be 2 on each? Anyone have a picture?
Keith True
Well-known member
There should be a nut and thin washer holding the stud tightly in place in the bakelite/plastic box.Not too tight though,the original boxes will easily break if that nut is tightend too much.Then all your wires go on where they belong,and another nut with thin washers.Those are your connections,not the outside cover nuts.Should be two on each.
Either I lost them or they were never there. It’s not like me to not put them back on after taking them off so I don’t lose them. I would imagine that not having both would cause all sorts of issues. They were run up pretty close to the cover as off the original owner put it together minus the two……
rotorwrench
Well-known member
This is a good link for all electrical system data; It's not inclusive and it has at least one flaw that I noticed but it's good to go for the terminal box.
https://www.lionsgatemodelaclub.com/Reference Info/2018 Reno Electrical System Alex Janke (1).pdf
Be aware that there was a change in the earlier service bulletins that updated the coil connection so that it would be included in the ammeter circuit. This way it can help a person diagnose the ignition system to a certain degree. The PDF reflects that change by giving the early and post bulletin diagrams. The flaw I noticed was the way the ammeter is connected in a photo. The diagrams are spot on.
https://www.lionsgatemodelaclub.com/Reference Info/2018 Reno Electrical System Alex Janke (1).pdf
Be aware that there was a change in the earlier service bulletins that updated the coil connection so that it would be included in the ammeter circuit. This way it can help a person diagnose the ignition system to a certain degree. The PDF reflects that change by giving the early and post bulletin diagrams. The flaw I noticed was the way the ammeter is connected in a photo. The diagrams are spot on.
