See if we had read your article on my web page, we would have known that.....
The one thing your article has Emery is the timing. I am going to try and
throw up a picture of that when I can.
gene
>Al - I had sent the following message in response to a question from Lanier
>last April 6. I looked it up to see what I had said about the red and black
>leads. Glad to hear that you got yours working all right. Guess this is an
>easy thing to get reversed even if one has done them before.
>
>Emery Stora
>
>points. This includes all (Model NH) Onan generators installed on GMCs.
It
>is called Magna Arc, part number 160-1376. I believe this is the only one
>they have called Magna Arc. It contains an ignition module, cover and cover
>clip, base plate and gasket.
>
>This new unit will not fit as is comes out of the package. The main problem
>with the new unit is there is insufficient room to make adjustments to the
>adjusting screw, so you can cut off both right angle sheet metal bends that
>hold the adjusting screw and discarded the adjusting screw, spring and
>washers. It is very easy to do this with one cut. Loosen the adjustment
>hold down screw and move the two metal bracket pieces so that are lined up
to
>the left. Then remove the adjusting screw, spring and washers and make a
cut
>with a hacksaw on the right side just even with the outside of the hold down
>washer. Throw away the two small pieces you cut off. File the cut edges
>smooth. Then remove the points and condenser from the old base plate and
>remount the old base plate, using the new base gasket. The new components
>will screw down under the two screws used to hold the baseplate. Then time
>the engine using a timing light per the instruction sheet. Disregard a lot
>of the timing instructions that come with the new parts. They talk about
>marking the shaft and even removing the cover. You don't have to do that
>with our Onans. We have a small hole, about 1/2" in dia. on the top inside
>of the fan housing. Point your timing light at the hole and there will be a
>single timing mark. Move the bracket by finger adjustment until the timing
>mark lines up in the hole. Then tighten the locknut on the adjusting back
>plate when the timing is correct. The new cover has a grommet that fits
over
>the wires. If you drill a hole in the new cover in the same location as the
>old cover it will fit and you can discard the new cover clip. There are two
>wires coming out of the module. The red one goes on the hot lead to the
coil
>(the back one on mine). The black lead goes to the ground side of the
coil.
>The old points had a push on connector. The new black lead has a ring
>connector so it will be necessary to get a nut that fits the threaded
>terminal. The Onan is much easier to start and performs exceptionally well.
>
>I see that Dave Melton has posted another way to install it. While working
>on mine, I looked at reversing the new base plate which shifts the case to
>the right (the manifold is in the way otherwise) but then determined that
the
>two mounting holes are offset from the shaft hole so I would have to drill
>two new holes and do a little grinding for clearance. I decided that it was
>easier and quicker for me to make one hacksaw cut than to attempt to
>accurately line up and drill the two holes.
>
>Dave's method retains the adjustment screw, but since it could be years
>before I'll have to adjust it again. It is simple just to move the
>adjustment bracket with my finger. I don't even have to find a tool.
>
>Both methods should work fine. As I've said before (to the horror of you
cat
>owners), there is more than one way to skin a cat.
>
>Emery Stora
>77 Kingsley
>Santa Fe, NM
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
