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In this case, for some reason; one relay cancels the action of the other, Gregor - for some reason. One relay engages the solenoid, and as it does, the other relay activates to cancel the first ( or the other way around) - and the solenoid doesn’t know what to do…
Diodes are sometimes used to prevent such mutual interference. However, as Paul and Doug implies you may have incorrect relay(s) for the diagrams connections to work. Which may be solved by different connections…
Original set-up; the starter relay connects brown (C2) to solenoid white/red - it’s the sole function of the starter relay.
The starter relay solenoid is powered in ‘crank’ white/yellow (W2) - though in your schematic indicated white. But relay will only engage when coil is grounded white/black (W1)…
…which is done through the inhibit relay; connecting white/black (82) to black (30). This connection is made when the inhibit relay engages…
The inhibit relay coil has power in ign ‘on’; white (86) via the inertia switch. Inhibit relay operates when black/green (85) is grounded - through the "neutral’ (aka ‘start inhibit switch’ in old speak).
Shorting inhibit ‘87’ to ‘30’ simply connects starter relay W1 directly to ground - and the starte relay then engages as key is turned to crank (powering W2). Black/green ‘85’ to ‘30’ does the same; it grounds W1 (providing the gear lever is in ‘N’ or ‘P’)
The first ‘jump’ bypasses both the inhibit relay and the neutral switch. The second bypasses only the inhibit relay - in fact establishing the earlier ‘inhibit switch only’ set-up. Which you can use while sorting out the problems…
As the wires used in testing seems properly attached to their destinations - the problem is likely wrong relay(s), not connecting the destinations as intended. Keep in mind that black wires are direct ground, while black/something indicates an indirect ground…
Relays can be tested to find out what they actually do - and different connections can then be considered. Basically all relays do the same; connecting two (or more) terminals when the two others (relay coil) is respectively powered and grounded…
You do have power on inhibit white with ign ‘on’…?
Frank
xj6 85 Sov Europe (UK/NZ)