Working on Bally Eight Ball. The Stern TA100 rectifier board will not give me the proper readings (everything is too low). Here is what I did with pics:

Meter on DC except for TP4...

Should be:
TP1 (AS2518-18): 6.4 volts DC.
TP2 = 195 volts DC (could be as low as 150 volts).
TP3 = 13.5 volts DC.
TP4 = 7.5 volts AC.
TP5 = 47 volts DC.

I get:
TP1: 0.2
TP2: 20.6
TP3: 2.2
TP4: 0.1
TP5: 3.6

Swapped rectifier boards - same low readings
Fuses are all new and checked
Changed all the parts on second rectifier board - same low readings
Put original rectifier back on - checked the values on all parts, bridges/diodes test proper, resisters check out, continuity works where it should

Checked the wiring and tried with J2 only, with J2, J1, J3, J2 and J1 only - same low readings

Checked the wiring from transformer to Stern TA100 VS Steve Kulpa's page
Checked the wiring of the connectors. J2-7 instead of a blue wire I have white for AC Neutral (checked back to the RFI filter for continuity)
Checked the transformer with only fuse F6 and I get all the right values at the test points:

E2-6: 49VAC
E8-10: 173VAC
E17-18: 7.3VAC
E13-14: 7.8VAC
E15-16: 12VAC

I cannot tell what is wrong. What I checked addresses transformer (seems good), connectors (J1 seems fine), rectifier checks out (parts wise)

Looking for advice on what I am missing. Thanks!

The only oddity (not related to J1) is there is an after factory fuse for GI Bus (see pics), but fuse checks out (20a). Someone put it in before I got the machine.

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@billc479 Thank you sir! That was it. Connected the ground strap (was frayed and laying in the cab). Just goes to prove sometimes in pinball it is the simple basic things.