1/27/2024 0 Comments Onan 4000 generator parts diagram![]() ![]() Step four- Next, you need to use a screwdriver and remove the wires from the starter solenoid and carefully remove the wires. Take care to not let the end of the cable touch anything metal, etc. You do this by removing the negative battery cable. Step Three- Now you are to disconnect the circuit. Step two- Make sure the generator’s battery is fully charged before taking any of the following steps You can use a 12-volt light tester or a multimeter Step One- you will want to get your tools first. This is basic electronics and Onan has not found a better way to test their solenoid starters. The following instructions are for just about every model of generator out there. The motor wire should be identified by the M next to it. You can look for the letters to help you do the right type of wiring. The wires should route in opposite directions to make sure you do not hook up a wire to the wrong terminal. This is the ground wire and you only usually see it if your generator has a 4-post solenoid. Now in some cases, you will see a 4th wire attached to the solenoid starter. The final wire will be the motor wire and it connects to the starter motor. This wire is a thing one so you shouldn’t be able to confuse the battery wire with the ignition wire even if they are the same color. The terminal on the solenoid should have an S next to it. ![]() ![]() This one hooks to the solenoid and connects it to the ignition switch. The second wire will be the ignition or starter control wire. The terminal should have a B on it for battery so you do not get confused. The first wire is the positive one that connects the solenoid with the battery. There are only supposed to be 3 wires that directly connect to the starter solenoid. Here is a more complicated wiring diagram and it is for the 6.5 model: That is the uncomplicated design and this is for the Onan Genset 4.0 model. In many cases, the starter solenoid is connected to the relay, the F1 relay as well as the start/stop switch. The best thing to do here is to place a diagram so you can see what we are talking about. Keep yourself protected at all times while you do this type of work. You will have to remove the casing to get to it.Īlso, make sure you have no power running to the generator as you search for the starter solenoid. The starter is usually at the back of the generator. In most cases, according to the diagrams we saw, the starter solenoid is near the starter. There should be a diagram for all the parts The best thing to do if you are not sure where your starter solenoid is, look it up in your manual. If the generator is built-in, you will have to remove it to make any repairs to this part. For the Microlite 4000, this part will be on the back side of the generator in the upper right area. Since Cummins/Onan makes so many models the location for its starter solenoid may be different for each model. ![]()
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