??? - factory mount - warning light assimilator - 74 Mk2

joe czech · Jul 30, 2019

fitting the wiring harness in my 74 Mk2. when I got the bike, the original coil mounting bracket and associated components were not installed, but in a box of parts. I have everything figured out, but at a loss at where the WLA mounts. so, can anyone tell me where the factory mount is located - a pic would be great. thanks....

follow up question -- which side of the rear frame bulkhead does the flasher mount? mine was mounted on the forward side, but I can't rely on anything since there were several folks messing around with mods and wiring - everything was pretty much a mess.

it seems everything with the lucas replacement harness is falling into place with branches of the harness (leads for the bridge rectifier and the flasher) routing on the aft side of the bulkhead. i'm thinking some Mk2's had the bridge-rectifier mounted on the aft side - correct? again, thanks in advance....

maylar · Jul 30, 2019

It\s wrapped in a coil spring p/n 063909 and attached to the under side of the ignition coil bracket with the left side coil's front bolt and a nut.

joe czech · Jul 30, 2019

maylar said:
It\s wrapped in a coil spring p/n 063909 and attached to the under side of the ignition coil bracket with the left side coil's front bolt and a nut.

got it - thanks!

maylar · Jul 30, 2019

joe czech said:
follow up question -- which side of the rear frame bulkhead does the flasher mount? mine was mounted on the forward side, but I can't rely on anything since there were several folks messing around with mods and wiring - everything was pretty much a mess.

it seems everything with the lucas replacement harness is falling into place with branches of the harness (leads for the bridge rectifier and the flasher) routing on the aft side of the bulkhead. i'm thinking some Mk2's had the bridge-rectifier mounted on the aft side - correct? again, thanks in advance....

Both of those items are on the forward side (inside battery box) on mine, but I have seen them mounted on the aft side on some bikes. I've done some mods to my electrics over the 44 years I've owned it, so it's possible that the original mounting was different. I recall that the "blue can" capacitor was a tie point for the battery wire going to the zener diode and the flasher is a tie point for the main power wire feeding the harness. I believe that my buddy's 72 has both rectifier and blinker on the back side of that bulkhead.

L.A.B. · Jul 30, 2019

joe czech said:
follow up question -- which side of the rear frame bulkhead does the flasher mount? mine was mounted on the forward side, but I can't rely on anything since there were several folks messing around with mods and wiring - everything was pretty much a mess.

The Mk2A flasher relay and rectifier were mounted on the front to make room for the Mk2A tool tray which occupied the space behind the plate.

https://www.accessnorton.com/NortonCommando/mk2a-commando.16286/#post-236535

joe czech · Jul 30, 2019

L.A.B. said:
The Mk2A flasher relay and rectifier were mounted on the front to make room for the Mk2A tool tray which occupied the space behind the plate.

https://www.accessnorton.com/NortonCommando/mk2a-commando.16286/#post-236535

thanks (L.A.B.) for the link - now i'm a bit puzzled. my Mk2 (and i'm assuming I DON'T have a Mk2a) has that rectifier mounting plate, and it looks to be original to the bike. unless I reading things wrong, it appears to be a Mk2a feature. my original rectifier and Zener diode were in the parts box, and I had a half mounted podtronics. I can't confirm the original configuration of anything - TOO MANY folks in there modifying this, modifying that, rewiring this, and rewiring that - most of which doesn't make much sense to me. at the bottom of the mounting plate was a grommet with the wiring for the rear brake switch snaking through from the front side to the rear, and turning 180, and snaking under and around the bottom locating peg for the LH side cover, then down behind the left "Z" support plate. doesn't look to be factory, but I really don't know.

maylar · Jul 30, 2019

My MKII also has that rear plate, and the grommet for the brake switch wires as you described.

L.A.B. · Jul 30, 2019

joe czech said:
my Mk2 (and i'm assuming I DON'T have a Mk2a) has that rectifier mounting plate, and it looks to be original to the bike. unless I reading things wrong, it appears to be a Mk2a feature.

The 'Mk2A' 064974 rectifier bracket seems to have been fitted to (later?) Mk2s so probably is original.

joe czech · Jul 30, 2019

maylar said:
It\s wrapped in a coil spring p/n 063909 and attached to the under side of the ignition coil bracket with the left side coil's front bolt and a nut.

well, went back into the garage and my mounting bracket is not configured with nuts (coils to bracket, and bracket assembly to frame), so no nuts. seems there are threaded inserts integral to the bracket mounting as well as the coil mounts. I can't see where the WLA mounts to any existing hardware. the spring mounting loop it would have to be under the head of an existing bolt - ??????????? - about ready to drill a frickin hole -

anyone got pics of a stock factory assembly?

L.A.B. · Jul 30, 2019

https://www.accessnorton.com/Norton...restoration-project.20181/page-13#post-300792

maylar · Jul 30, 2019

joe czech said:
well, went back into the garage and my mounting bracket is not configured with nuts (coils to bracket, and bracket assembly to frame), so no nuts. seems there are threaded inserts integral to the bracket mounting as well as the coil mounts. I can't see where the WLA mounts to any existing hardware. the spring mounting loop it would have to be under the head of an existing bolt - ??????????? about ready to drill a frickin hole -

anyone got pics of a stock factory assembly?

Yes, the coils mount with 2 bolts each, that thread into the coil support bracket inserts. One of the bolts (the front-most one) for the left coil is longer than the others. The loop on the WLA spring goes over the end of that bolt and is secured with washer and nut. No pics, sorry.

Deets55 · Jul 30, 2019

Joe,
FWIW. I have an early MKIII that came with the can type assimilator. Mine was tucked up under the right side of the fuel tank where all the harnesses came together. There was not enough wire to move it very far so that was probably where it was originally. It’s been replaced with a solid state unit so I have no pictures.
Pete

L.A.B. · Jul 30, 2019

Deets55 said:
I have an early MKIII that came with the can type assimilator. Mine was tucked up under the right side of the fuel tank where all the harnesses came together. There was not enough wire to move it very far so that was probably where it was originally. It’s been replaced with a solid state unit so I have no pictures.

It was probably moved on the early Mk3 (below) due to the suspensory spring.

??? - factory mount - warning light assimilator - 74 Mk2

maylar · Jul 31, 2019

L.A.B. said:
The Mk2A flasher relay and rectifier were mounted on the front to make room for the Mk2A tool tray which occupied the space behind the plate.

What is this tool tray of which you speak? Is it available anywhere and can it be retrofit to a MKII?

L.A.B. · Jul 31, 2019

maylar said:
What is this tool tray of which you speak? Is it available anywhere....

It's a standard 'A' (Mk1A* & 2A*) part: https://andover-norton.co.uk/en/shop-details/16282/tool-tray-850-mk2-
(Says "Mk2" but should be 2A).

maylar said:
and can it be retrofit to a MKII?

Yes, if the rectifier and flasher relay are not fixed at the rear of the frame plate.

*(Mk3 is basically the same part but with a slot for the seat lock plate.

Tool tray (with slot) on my Mk3.

kommando · Jul 31, 2019

Its a thin plastic vacuum moulded item

https://andover-norton.co.uk/en/shop-details/16282/tool-tray-850-mk2-

You need to clear the area between the frame bulkhead and the front of the rear mudguard, it does not carry much and I do not bother fitting any tools as its too short. It has a rag, sparkplugs and a few other small items, the rag is laid over the contents as there is no lid and items can depart out the top as there is clearance to the seat bottom.

maylar · Jul 31, 2019

Thanks. I have a tool roll (pouch) that I carry in the left side cover, but it's become a bit too fat to squeeze into that compartment. Wouldn't be much chance of it departing from the tray, though if it's really thin plastic it might not support the weight of the tools.

L.A.B. · Jul 31, 2019

maylar said:
Wouldn't be much chance of it departing from the tray, though if it's really thin plastic it might not support the weight of the tools.

It is flimsy but it's supported by the mudguard so will take the weight of tools.

??? - factory mount - warning light assimilator - 74 Mk2

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