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Replace battery terminals and/or clean battery posts. Horn and radio don't use as much juice as starting. Sounds like a lack of amperage or electrical pressure to push the starter motor. Also check battery. Needs 12 or more volts and about 600 or more cranking amps.
Some models have single horns, others have two (or more).
Some horns are already earthed, hence may not require the use of an earth wire.
If you have noticed a spare wire/connector coming off the horn harness, this could simply be part of the standard factory horn harness (which was also used for the multiple horn types), making this a redundant connector.
If your horn is working, then I believe the all is in order. If however, your horn does not work, then suspect there is a broken connection.
The power steering pump is normally connected or driven by the engine with a V-belt. A loose belt can cause squealing as soon as the power steering come under load (e.g. steering left or right while stopped).
Check the tension on the V-belt directly connected to the power steering pump. This may need replacement.