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You need to supply more information.
What is the signal source?
What is the relay resistance?
Try the 12V relay on 10V, it may well work.
Could you use a 6V relay with series resistance?
The relay needs 12V and 120mA to work properly.
The signal source is 10V but you have given no indication of the current capability. You give no information on the current demand of the test light.
If the source has a very low current capability, at 10V it can still be used to switch a power FET to drive the relay.
A FET could perhaps switch the load directly, not using the relay. What is the load?
An IRF540A has an on resistance of under 0.1 ohm and can take 5 or even 10A.
I show a circuit with some components to protect the FET from spikes.