So the add bonus relay just blips quickly and drops out again? If you hold it in with your finger for a cycle, does it score?

Does the bonus unit increment/decrement okay when operated manually?

Going through this same thing on my SC. Reach under the playfield to the sequence bank and trip the relays in order from left to right. the first 5 are the rollovers.

Fantastic

So even with E held in it isn't scoring the 500 points either? That sounds like more than just the bonus not advancing, something farther back.

Do the 500 pts inner flipper lane rollovers and the kicker hole scoring work correctly?

For that E relay problem, I'd look at the 2 motor switches highlighted in this snippet. The Motor 1C switch has to be closed for any of the rollovers or drop targets to score 500 pts. Make sure that switch is clean and making good contact when the score motor is at rest in the home position. If that switch is closed, any of those drop target/rollover switches should energize the E relay when they close.

The Motor 2B switch is part of of the E relay's lock-in circuit. It needs to be closed until late in the score motor cycle for the E relay to stay energized long enough to give you all 500 points. The E switch in series with it also needs to close when the E relay energizes.

Surf Champ E relay (resized).JPG

In this part of the circuit, you can see a m/b switch on the E relay that has to send a pulse to the "Add Bonus Unit" coil. So that E relay needs to be working.
Only one of the 5 Motor 1A pulses makes it through the Motor 3C switch and E m/b switch to get to the coil.

Surf Champ add bonus circuit (resized).JPG

Do you mean Motor 3C SL+RED? Not sure where you jumpered to.

Usually, the dogs are all in the "S" position except for the one on Motor 2C - that one's usually "L" Don't know why they didn't write that on this schematic.

Hmm...not sure what that jumpering proved. I would probably try jumpering across the Motor 2B switch in the bottom of the snippet on post #10. The wires would be MAR-WH and RED+WH. See what happens to the scoring if you do that.

I checked a few other schematics from 1976 and the dogs are as I said in the post above....all "S" except for 2C which is "L".

The fact that the motor runs constantly makes sense - you're jumpering across the Motor 2B switch, so closing any drop target or rollover switch should energize E. There is a switch on the E relay that starts the score motor turning. Then since you've shorted Motor 2B, it can't de-energize, so the motor would keep running.
BUT - you should be getting scoring. Is your E relay energized the whole time the motor is running?

That E relay coil should have a black wire on one side and a WH-OR wire on the other. Did you jumper to that WH-OR wire? I know colors fade and are hard to read.

If your E relay is energizing, and the switches on it are opening and closing as they should, you should be getting 500 points each time the score motor turns 1/3 of a revolution via this red circuit below:

Surf Champ M relay again (resized).JPG

There are only 2 switches in this circuit - the Motor 1A switch and the E relay switch.

If you're not sure about wire colors... what's + mean, what's - mean, does it matter which color comes first... there's a great link that MarkG wrote that will explain things.

https://pinside.com/pinball/forum/topic/gottlieb-wire-color-trivia

If you can't get 500 pts., I'd look at those 2 switches I mentioned in post #21 - the E relay switch and Motor 1A. Use the wire colors to identify the switches.

If you manually close the M relay (probably in the head), do you get 100 pts. each time you do it?

I think you have some confusion about a relay and a switch on that relay on the schematic. The E relay is the coil pictured in the upper left up in post #10. All switches marked with an "E" are switches on the E relay - not the E relay itself.

So in your last post, I'm assuming that you're jumping each of those switches in the red part of the circuit in post #21.

Am I understanding correctly that when you jumpered across (shorted) the E switch, the score motor turned 1/3 rotation? Did you have to do anything to make the score motor turn? When it turned the 1/3 rotation, did you get any points?

Start a game, then go to the back of the machine. If you press the armature of the M relay (100 pt relay) in with your finger or a stick, do you get 100 pts each time you do it? I'm just trying to find out if your M relay is working.

Thanks for the clarification. Your first jumpering across the Motor 1A switch proves that the E switch (both in post #21) is working. When you close a rollover switch, the Motor 1A switch is now shorted, and the E switch on the E relay must be closing, so you're getting a single pulse to the M relay. So I guess the M relay is working as well, though I'd still like you to press it a few times with your finger and see if you get 100 pts each time.

So I'm curious about that Motor 1A switch. Motor switches with an "A" on the name open and close 5 times per score motor cycle (1/3 rev.). That switch is supposed to give you 5 pulses to the M relay when the score motor turns AND the E relay is energized (which closes that E switch).

What happens if you jumper across just the E switch and close a rollover switch to start the score motor? If you don't get 500 pts, you may have a problem with that Motor 1A switch.

According to the schematic, jumpering that E switch should be jumpering the BL-OR wire to the YEL-BL-RED wire. It's hard to tell on that picture which is the YEL-BL-RED wire, but hopefully, you can look at the switch and see where the 2 tabs are that go to each switch leaf on the other side of the stack.

Once you've jumped that E switch, start the score motor - either by closing a rollover switch, or just pushing the score motor past the home position - and see if you get 500 pts, or not. If not, there's something wrong with that Motor 1A switch.

I agree with paulace that the 1A switch is a problem. Pitted contacts can’t be cleaned well with sandpaper. I use a metal points file on these switches to get a clean finish. Adjust switch to get the strongest closed connection when activated.

Plus sandpaper leaves a lot of extremely non-conductive debris behind.

When you get the bonus increment but only 100 instead of 500, does the 100 reel advance at the start of the motor cycle or at the end? I.e. is it quickly incrementing, or locking on until the cycle ends?

Weird that you even get 100, a motor switch provides the five pulses so normally you'd get 500, otherwise nothing. Unless this is just something to do with the jumpering for the tests. It does this 100 point thing on players 2 thru 4 as well?

Hey frenchy - I think that in some of his jumper tests, he was jumpering Motor 1A, so it would act as a continuous short rather than 5 openings/closings....1 pulse rather than 5.

Didn't tell me anything about Motor 1A, but it did tell me that the E switch in series with it in post #21, was good since that one pulse made it to the M relay.

Okay so with *no* jumpering, if you manually activate E relay (and hold it in if it doesn't hold for whatever reason) it should score 500, or nothing, not just 100, correct?

Yeah, that's how I see things - I would guess he'd get nothing. But we'll find out sooner or later!

Glad you got it sorted! Man, that's a nice looking machine - if those switches are half as clean as the rest of the machine, you shouldn't have any problems! Have fun with it.