It does no harm to disconnect the battery when working on a vehicle but in general no, you do not need to disconnect them to change a filter.
Underneath the air filter box on the driver side. There is a modual called the CCRM with a harness coming out of it disconnect the modual. dont forget to disconnect the battery first... the relay is inside you can either replace the modual or take it apart and solder in an new relay. The ac, and fuel pump relay is also located inside.
To replace the relay on the Engine Control Module (ECM), first, disconnect the vehicle's battery to ensure safety. Locate the ECM, which is usually found in the engine bay or under the dashboard, and identify the relay you need to replace. Carefully unplug the faulty relay from its socket, then plug in the new relay, ensuring it's seated properly. Finally, reconnect the battery and test the vehicle to ensure the new relay functions correctly.
Disconnect horns, disconnect battery, disconnect relay, disconnect fuse .........................................or repair problem.
To replace the flasher relay on a Fiat Bravo, first, locate the relay, which is typically found in the fuse box under the dashboard or in the engine compartment. Disconnect the battery to ensure safety, then remove the old relay by pulling it out of its socket. Install the new relay by pushing it firmly into place, and reconnect the battery. Finally, test the turn signals to ensure the new relay is functioning correctly.
The fuel relay on a 1997 Pontiac Grand Am is located in the under-hood fuse and relay box, which is typically found near the battery. You can identify the fuel relay by consulting the diagram on the inside of the fuse box cover. If you need to replace it, be sure to disconnect the battery before accessing the relay.
Follow the wiring harness from your blinker. Disconnect the factory harness from the relay. Replace with the new relay.
The fuel filter is behind the right rear tire. To access you need to remove the right rear back tire. If you plan to change the fuel filter it is a good idea to disconnect the fuel filter relay and start motor until it stalls. Also, disconnect battery prior to fuel filter removal.
To replace the fan motor relay on a 1994 Ford Tempo, first, locate the relay in the fuse box, typically found under the hood. Disconnect the battery to ensure safety, then remove the relay by pulling it straight out of its socket. Insert the new relay by aligning it correctly and pressing it firmly into place. Finally, reconnect the battery and test the fan operation to ensure everything is working properly.
To replace the horn relay on a 1995 GMC Vandura 3500, first locate the relay in the fuse box, which is typically found under the dashboard or in the engine compartment. Disconnect the battery to prevent any electrical shorts. Remove the old relay by pulling it straight out of its socket, then insert the new relay firmly in place. Finally, reconnect the battery and test the horn to ensure it’s functioning properly.
You will need a simple inexpensive tool to disconnect the lines from the filter. Your local auto parts store will have the tools you need. Warning! The fuel system will be under pressure. Before disconnecting the fuel lines from the filter, remove the fuse and/or relay for the fuel pump, then try to start and run the engine until it runs out of fuel. The pressure will be greatly reduced when you disconnect the lines from the filter. Be prepared for some fuel loss. Replace the fuse and/or relay only after the filter is replaced and reconnected. Run engine and check for leaks.
I found out you don't have to relieve the pressure to replace the fuel filter. Only small amounts of fuel stay in the old filter, so when removing it, place in a plastic bag or other container. Mission accomplished. To relieve the fuel pressure all you have to do is remove the gas cap.
To replace the heater blower relay on a 1990 Cadillac Fleetwood Brougham, first disconnect the negative battery cable to ensure safety. Locate the relay, which is typically found in the fuse box under the dashboard or near the engine compartment. Remove the old relay by gently pulling it out, then insert the new relay in the same position. Finally, reconnect the battery and test the blower to ensure it operates correctly.