What game?

Bally "Hi-Deal" is one game I know of that can award replays and extra balls simultaneously.

I'm sure it would be a one wire splice, but would have to contemplate from where.

The problem with Aladdin's Castle at least is that the extra ball relay looks like it's locked on when activated (to keep the shoot again lamps on). So you'd need to pulse the knocker coil once right when you collect the extra ball, and not keep doing it otherwise. A new circuit could be added to do this.... find whatever pulses the extra ball relay initially and add a circuit to pulse the knocker. There shouldn't be feedback from the knocker to the rest of the circuit as when the plug is moved to extra ball instead of replay there won't be a connection path that way.

If you read the EM schematics decoded threads by xsvtoys
https://pinside.com/pinball/forum/topic/em-schematic-fully-described-from-beginning-to-end-bally-bon-voyage
and
https://pinside.com/pinball/forum/topic/em-pinball-machine-complete-circuit-description-2-bally-monte-carlo#post-5205203

you can get an idea of what's involved in each circuit, and possibly how to modify it.

If you love the knocker that much, wire it off one of the scoring relays, or better yet buy one of the EMs that actually uses the knocker for scoring before it became a replay feature. You will get plenty of knocker that way.

I would think the easiest way to do this would be to have all the settings to “credit”, so you get the knock. But have a wire to engage the EB relay when the knocker fires.

Nothing like simplicity there. Makes much more sense and a lot easier to implement.

I love knockers

I think you’re right, jumping them together would make the EB relay hold the knocker on as well. Would a diode on the jumper work?

Hi hjh632
the problem as said by other pinsiders (and You wrote about in post-1) : The solenoid / coil on the Knocker sticking pulled as long as the Extraball-Relay pulls.

I know a solution - not 100% - maybe 80% solution - we may blandish*** / sweet talk / whitewash (words from a dictionnaire) the rest (20%) ...

Lets have an Grand Prix in Replay mode - we can make replays by the counters (Score-Drums) - making an Special , through Number-Match feature. AND the Grand Prix has an standalone Extraball-Feature - see here https://www.ipdb.org/showpic.pl?id=1072&picno=43161 and here https://www.ipdb.org/showpic.pl?id=1072&picno=35555 - through an lit Inlane.
In Replay mode the Knocker knocks when we make an Replay - the Knocker does not knock when we make an Extraball.

You want to set the pin to Extraball-Mode (((we may say as well Add-a-Ball mode))) - You must disable the Number-Match feature. My 80% solution makes the Knocker to knock in the situations: Make an Extraball by the counters (Score-Drums) - making an Special. The standalone Extraball-Feature does also work - but (the 20%) : The Knocker will not knock.

In post-1 You wrote: "dont care getting credit / replay". See the JPG - an old picture of the Replay-Unit in my Williams Shangri La. When I lift the arm "marked with an rosa / pink dash" - and keep it permanently lifted: The horizontal (step-up) plunger and the vertical arm still can move and so the E.O.S. (End-of-Stroke) Switch "orange 3" still is actuated. And You mount another stand-up leaf-switch at "orange 3" to also be actuated - and the new switch then is wired to make the Extraball-Relay to pull-in. Means You have the pin in Replay mode - but will be rewarded with "Extraball".
(((I will brood over "can we do it without adding an new switch" - but I am not very optimistic)))

blandish***: The old - very common Extraball-Feature is just not worth to be rewarded with a Knocker-knock. Greetings Rolf

0Shangri-La-Replay-Unit10 (resized).jpg

Hi hjh632
You did not write what You think about my suggestion (post-17).
When You switch the Adj-Plug from "Replay-Mode" to "Extraball-Mode" and want to have the Knocker to knock for ALL different ways "making an Extraball": You need a relay that pulls-in for a short period of time (to let current flow to the coil on the Knocker) - THEN the relay must quit pulling (to stop the current to flow to the coil on the Knocker).
Here https://www.finder-relais.net/en/finder-relays-series-85.pdf there is such an relay. In my JPG (here) I show snippets of the "Finder-documentation". The function "GI" is of interest --- the coil on the knocker will get current for 0.5 second, the function "DI" should also work - the time "... will get current" is adjustable --- I am not 100% sure how the function "DI" works - but for sure the function "AI" hooked together with an Finder-Relay type 40.52 ... also works. See 40.52 here https://www.finder-relais.net/de/finder-relais-serie-40.pdf .

I once bought me in Zuerich (Zürich) such an Finder-85.02 ... relay for an mod on my Gottlieb Joker Poker SS --- I did use the "AI" function together with some 40.52 relays. On December the fourth I will be in Zuerich again - I could go to the "kind of an Radio-Shack" store I have bought the relays - go there and ask about the "DI" function.

The wiring You must do is quite easy to do - BUT the costs ... 40.52 relays I can buy for around 7 US-Dollars - the needed 85.02 - pooh --- I paid something like 30 or maybe 50 dollars. When I do Google-Search for buying Finder-85.02 relay I always land on european sites - I do not know if You can buy such relays in the USA and what price You must pay.

Here https://produktinfo.conrad.com/datenblaetter/175000-199999/195901-as-01-de-Ein__und_Ausschalt_Verzoegerung.pdf only look at the last page - the schematics --- You may ask the electronic-freaks in pinside for a kit to buy to make an "pull-in, after (maximum 0.5 second ?) some time quit pulling" goodie for Your "Extraball-Modifation making the Knocker to knock". Greetings Rolf

0Finder-spec-Relays-Work-01 (resized).jpg

Hey Rolf, Do you think something like this (24 volt version) would work similarly to the relays you mentioned?

ebay.com link: DC5V 12V 24V Infinite Cycle Delay Timing Timer Relay Switch Loop Module 1S 15min

Hi edednedy
I do not understand much on electronic stuff --- I suggest to start an new topic in an SS-section here in pinside - asking for help. In EM-pins You in the USA have at hand 110VAC - 48 or 24VAC - maybe also 48 / 24DC as there is an rectifier in the pin - would this EM-Pin rectified DC be good enough DC-feeding for a kit You buy ? Well, I clicked on the link (in Your post-19) - nice - load power AC 0 to 250 Volt - what is DC + - 12Volt ? - are "Turn on / Turn off" sockets to plug-in wires where we then can let flow (or not flow) pinball-machine current (for our needs) --- I do not give advice on stuff I do not know. I know I did implement an Finder-85.02 relay in my Joker-Poker-mod and it did work.
(((As I have taken out the stuff - (I may sell the Joker Poker) - I am thinking about: To use the Finder-85.02 relay in another way - using the "SW" function - rapidly on-switching -off-switching etc. current --- using in the feeding line to a score-motor --- the motor will turn at half speed --- maybe I can use this half-speed turning on "problemshooting when motor-switches are in question"))) Greetings Rolf

This reminds me of my thread, I also wanted the knocker to sound when Added Ball awarded as AAB disabled the replay stepper hence knocker. The games were Rocket III and MiniZag fitted with the AAB kit, but the thread may be of interest.
https://pinside.com/pinball/forum/topic/adding-knocker-to-bally-aab-added-ball-kit-models

It probably can be a wire or two. It's finding the appropriate circuit that's complicated....

There's probably other ways, but splicing in a Latch/Trip Relay would do the trick..