Why do alternator belts stretch often on 1995 Nissan pickups?

Alternator belts on 1995 Nissan pickups often stretch due to factors such as age, wear, and exposure to heat and contaminants. The rubber material of the belt can degrade over time, leading to reduced tension and increased slippage. Additionally, improper alignment or tensioning during installation can exacerbate stretching. Regular maintenance and timely replacement can help mitigate these issues.