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How to start a diesel generator automatically?

Diesel generators are a convenient way to have backup power in the event of an emergency. However, they can be difficult to start if you’re not familiar with the process. We’ll show you how to start a diesel generator automatically using a timer. We’ll also provide some tips on how to get your generator up and running quickly in the event of an emergency.

Today, we’re going to show you how to start your diesel generator automatically. This is a great trick if you have a backup power source in case of an emergency. It’s also handy if you want to make sure your generator is always ready to go in case of a power outage. So the question is generator users is that how you can start your diesel generator automatically!

Now you don’t need to start your diesel generator manually every time. Using a simple timer device you can do it automatically and this is the best way to use a diesel generator as a backup power source and can also provide you with electricity during a power outage.

How to start a diesel generator automatically?

How to start a diesel generator automatically?

There are two ways to start your diesel generator automatically. The first is by using a manual transfer switch, and the second option is by using a simple plug-in electric timer.

Using A Manual Transfer Switch:

A transfer switch is used for multiple circuits that are close together. Each of these circuits can be transferred to another circuit instead of being connected directly.

The transfer switch is located in the box along with the circuit breakers for the house, so all you have to do is locate it. Using a voltmeter, turn off all power coming into your house (disconnect any connecting cords).

Next locate all circuits that connect to the generator (they should be marked “Generator” near the breaker box, or at least they should be labeled G1 and G2 or something similar), then turn one of them on (use a separate meter to make sure no power comes out).

If there are less than 120 volts present when one of your generator circuits is turned on, use an electric drill to send current to all other wires until you find a wire that has at least 120 volts on it.

After you have found a wire with 120 volts or more, connect the cord of your generator to the circuit you just found and ensure that all connections are secure, then power up your generator!

Using A Plug-In Timer:

If you don’t want to fool around with transferring or wiring, this is an easy solution. We recommend using a simple timer so that you can start your diesel generator automatically from inside of your house by simply plugging it in and setting a schedule.

There isn’t much difference between any of these timers and they’re quite inexpensive (you can find one for as low as $15). You can easily program your timer to turn on at any given time or even specific day(s) of the week.

There are two types of wiring configurations for this method depending on the type of generator you have. If your generator does not have a neutral wire, simply connect your black wire to L1 and the white wire to L2. If your generator does have a neutral wire, then just connect it directly to Neutral.

If you’re concerned about safety with either option, don’t be! Both methods are perfectly safe as long as you follow basic electrical safety procedures (like having an electrician double-check before doing any work).

You can also use solar panels and deep cycle batteries for cost-effective backup power that is silent and environmentally friendly while supplementing or replacing more costly forms of backup power generation.

What To Do When The Diesel Generator Cannot Start Automatically?


There are times that the motor or starter of the diesel generator fails to start up. This is a major problem for those who are not familiar with the processes of how to start diesel generators. However, it is also an easy fix provided you know what to do and have the knowledge on how to troubleshoot diesel generator problems. Here are some helpful tips:

1. Confirm oil pressure switch is working

Diagnose whether your oil pressure switch needs replacement or repair by confirming if there’s power running through it using an analog multimeter. Turn off the main power switch and unplug every wire connector before starting the diagnosis process.

Disconnect wires one at a time then check if there’s the voltage between these wires’ terminals using a multimeter set on AC voltage. If you don’t have it, then try to use the other set of wires if there is a voltage between them. Next check to see voltage output from the oil pressure switch by disconnecting its wire connections one at a time. Make sure that both terminals are well isolated before checking again for voltage output.

2. Connect the new battery

Try replacing drained batteries with new ones because they are probably too old or weak to turn the starter motor/engine over to start the diesel generator. Use either 12v or 24v DC lead-acid type to ensure sufficient power is needed for starting the engine successfully. Hook up battery connectors properly and securely back into place after installing new batteries.

3. Check fuel lines

Turn off the main power switch before doing this step. If the diesel generator has an electric fuel pump, turn it off first. Next, check if there are leaks in the fuel lines by using soapy water solution. If you see bubbles or foam at any of your fuel line connections then you need to tighten them up.

Wipe excess soap with a clean cloth or water for checking and tightening all existing or leaking fuel lines and their clamps properly and securely before starting the engine again.

4. Check oil

Check oil level before starting generator; this should be done every 4 to 6 weeks depending on how often you use it. Mix diesel fuel with oil – 1:40 – before filling up the storage tank.

Start motor after adding oil to avoid damage due to insufficient lubrication because high revs without sufficient lubrication will cause major engine problems immediately. Replace the air filter every two weeks or when you see that it’s already dirty and full of dust or debris.

5. Check batteries

Check if your battery terminals are corroded and need cleaning. Use baking soda and water solution to clean up corrosion and make sure to check whether battery hold down clamps are properly tightened to avoid acid overflow while starting diesel generators.


Running a diesel generator automatically is easy, but there are instances when it can’t be done. If you need to start your generator manually, use the steps above to make sure that your diesel backup power source runs smoothly. You may also want to check whether the battery needs replacement if your generator fails to turn on during an emergency.


Q 1) What if the battery is too old to turn on a diesel generator?

Replace your old or drained batteries right away with new ones for your safety. If your battery is beyond its lifespan then it may not be able to function properly which can cause major problems when turning on heavy equipment like power generators.

Q 2) Where should I store my fuel to make sure that it’s safe?

Store fuel in an open container or flammable storage cabinet inside enclosed structures at least 30 meters from any ignition sources to avoid explosion during starting diesel generators. Keep away from children, pets, and other potential hazards when storing diesel fuels including flammable vapors within closed areas.

Always follow manufacturer’s instructions regarding fueling up generator particularly about types of fuel to use depending on your generator model.

Q 3) What should I do while checking my batteries while turning on a diesel generator?

Never operate or turn on heavy equipment like emergency power generators indoors especially without adequate ventilation because carbon monoxide gas is colorless and odorless which can be deadly after long exposure. Also, make sure that all battery terminals and cables are securely tightened to avoid sparks and short circuits.

Q 4) Is there a way to prevent a diesel generator from leaking fuel?

Yes, a common way to prevent a diesel generator from leaking fuel is to regularly inspect unit units and replace parts when necessary. Use soapy water solution to test for leaks that are hard to detect, and tighten all lines properly using adjustable wrenches. Check fuel tank cap for possible leaks which can contaminate groundwater when spilled.

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