MTFCA Forum

Can someone direct me to some schematics for rebuilding a coil box? It's for my 1924 coupe.
Thanks in advance!

The plastic coil box rebuild kits come with instructions. Basically when you remove the old wood sections, save the metal contacts and bolts and nuts. Just clean up the bolts on wire wheel, you can even clean up the contacts on a copper wire wheel, even though the Ford original contacts are made from bronze, unfortunately, there's been some talk that the reproduction contacts are made from copper coated steel, they will not hold the same spring pressure on the contacts of the coil boxes in use. On assembly I do solder the contacts to the bolts to ensure electrical contact and then install with the ceramic standoffs and double nuts on the end. If You do choose to use replacement wood instead of the plastic, be sure to coat the wood with boiled linseed oil. I do use two coats of linseed oil to seal the wood against absorbing moisture from the environment, rain and car washes. As far as the individual coil boxes and their adjustments, that's a whole different story... In fact, that story will be played on YouTube tomorrow night at 8:30 p.m. via fellow Canadian Model T man... As per his post on our Forum early this morning.... He will be assessing the ECCT method of adjusting electrical coil output so each coil will have equal firing power.

. ....... ECCT - Hot or Hype ? .....Posted by "flivver" at flivverchannel.....
In my newest video, I explore the real-world effects of ECCT-tuned coils on my 1926 Runabout. Premiers on Sunday Nov 12 at 8:30pm EST. Join me then and we can 'chat' about the topic, or watch at your leisure some other time. https://youtu.be/HaTH32bvsSw

TimCarlson92 wrote: ↑

Sat Nov 11, 2023 6:30 pm

Can someone direct me to some schematics for rebuilding a coil box? It's for my 1924 coupe.
Thanks in advance!

Here is the Assembly schematic, found on Gallery link at top right of Forum page, under Vowell Art, lots of great schematics of T parts.



https://www.mtfca.com/phpBB3/app.php/gallery/image/127


The only wiring is for the positive terminal bolt, that is wired to the base common strip, at the rivet on the end, the wire goes to the brass bolt. Cut a slot in the head to lay the stripped wire into, and solder to the brass bolt. On assembly of the bottom plate, weave the wire into the slot below the hole for that + terminal bolt which is below the other standoffs.

I haven't done it myself, but I've seen folks on vintage car forums share some cool stuff about rebuilding coil boxes for old cars like yours. Maybe try searching on those forums or even YouTube for some step-by-step guides.

Tim,
One of the problems that has confounded Model T owners for the last century is a poor-running car due to the formation of carbon tracks in the wood of coil boxes. Several of my friends have had that problem. Even if you put new wood in yours the problem may occur down the road. Do a search - much has been written about it.

The solution is to buy a plastic replacement kit. If you have original contacts use them. I double them up with the new ones for additional strength.

Good luck!

TimCarlson92 wrote: ↑

Sat Nov 11, 2023 6:30 pm

Can someone direct me to some schematics for rebuilding a coil box? It's for my 1924 coupe.
Thanks in advance!

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Helpful hints
If you have a wood backers then seal it with something. I use Min-Wax wood hardner --
The picture is for the underside of the bottom - like your looking at the wire in the grooves