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Ford 9N, 2N & 8N Discussion Forum

solid state cutout relay??

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Rick

12-07-2003 07:23:53

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What do you think of this as a solution to my bad new cutout relay problem? I read on a Model T forum the following:
OK so your cutout is not cutting out.
Here's a cheap sure cure for sucha problem: Go to an alternator rebuilding shop and buy ( they may just give you) a diode from an alternator. Don't worry about capacity, as long as it's a 12 volt (or 100 volt for that matter) and at least 20 amp capacity or more you'll be okay.
on one end of the diode is a wire a couple inches long. solder on an electrical eye fitting of the size it takes to put a cutout connector screw through.
On the outside of the diode you'll need to solder a piece of 12 gage wire a couple of inches long with the same type of eyelet fitting soldered on.
put one end on the generator screw on the cutout where the wire comes out of the generator.
Now scratch the wire that is supposed to go on the cutout relay at the front (coming out of the wire loom) on the free wire of the diode. If you get a spark, you have the diode backwards. Unscrew the thing and turn the diode around and try it again. If there is no spark....get a small bolt and bolt the diode wire to the one that goes into the loom By-passing the cutout..
The amp meter should be "o". Start the engine and see how nice everything works.
I've had to do this many times on Fords, Packards, ect. when the cutout was not working or more often....we just couldn't find a cutout to fit.
You can make a longer wire on the diode to generator side so the diode can be hidden in the frame rail siliconed inside a piece of heater hose.
You can even solder the cutout points shut, and connect the diode on the front so it looks like it's all wired up correctly and working with the cutout.

Let me tell you what I did about twenty years ago and it is still working fine. I took the diode block out of a GM alternator(junk one,prior to the built in regulator)and cut a section of the block off with a saw.(the section holds one diode) I drilled and tappped two 8/32 holes in the block(the block is a heat sink)and made a small bracket to hold the
block in the cutout housing.I've never experiensed any
problems and it is a cheap fix.

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Dell (WA)

12-07-2003 08:10:40

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Re: solid state cutout relay?? in reply to Rick, 12-07-2003 07:23:53

Rick..... ....yep, that'll work. Only drawback (if any) is you loose about 1/2 volt across the diode junction. That means if'n yer 1-wire genny is outputting 7.0 volts, yer battery is only getting 6.5 volts of charging volts. YOU ARE STILL the charging controler by manually adjusting the 3rd brush on the back of the genny. If'n you feel competent to follow those instructions, go for it..... ....Dell, 40 yrs of electonics engineering experience

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bj/8n/mt

12-07-2003 09:40:44

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Re: Re: solid state cutout relay?? in reply to Dell (WA), 12-07-2003 08:10:40

What Dell said

Only thing I would add is to use a heat sink [forceps work fine] to keep the soldering heat off the diode. Some--not all but I know of no easy way to explain the difference--can be turned to toast with a soldering gun.

Your mileage may vary

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