I'm about to wire an electrical fan to my ms2 v3 ecu, I don't use an idle stepper valve, so i'm thinking of using the FIdle wire to the fan , and ground the other terminal of the fan to the car chassis, or to the sensor ground, which one is better ???
And does it work ?
Electrical fan wiring
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
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Re: Electrical fan wiring
FIDLE will supply ground to turn on a relay, but you must use a relay to control the fan as they need a lot of startup current.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
Re: Electrical fan wiring
Thanks for the info mate, yeah i forgot to mention about the relay, my question was just about the ground...Matt Cramer wrote:FIDLE will supply ground to turn on a relay, but you must use a relay to control the fan as they need a lot of startup current.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
By the way, my sensor ground is on the engine block 15 cm next to the megasquirt ground both in the engine block
Re: Electrical fan wiring
Then, how to wire the fan and the FIDLE cable to the relay, i mean i thought that the FIDLE was the positive and the fan ground the negative...Matt Cramer wrote:FIDLE will supply ground to turn on a relay, but you must use a relay to control the fan as they need a lot of startup current.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
Can you clarify to me how to wire things to the relay( the bosch 4 pin one, i.e where every pin goes...), as i'm a newbie with this
...Thanks
Re: Electrical fan wiring
+1, can the megasquirt case touch the car's chassis or it must be insulated by using plastic screws?Matt Cramer wrote:FIDLE will supply ground to turn on a relay, but you must use a relay to control the fan as they need a lot of startup current.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
Re: Electrical fan wiring
Can i run a wire directly from the battery(12v), the FIdle as (-) to the relay empowering(coil symbol), and the 2 fan wires to the relay(interuptor)?dochka wrote:Then, how to wire the fan and the FIDLE cable to the relay, i mean i thought that the FIDLE was the positive and the fan ground the negative...Matt Cramer wrote:FIDLE will supply ground to turn on a relay, but you must use a relay to control the fan as they need a lot of startup current.
Do not ground a fan to the sensor ground under any circumstances. They can be grounded to the chassis or engine block.
Can you clarify to me how to wire things to the relay( the bosch 4 pin one, i.e where every pin goes...), as i'm a newbie with this
Thanks
Re: Electrical fan wiring
Google "relay wiring" and it will give you a generic diagram how relays are wired.\it is important that the 12v supply to the relay comes from the megasquirt power relay(eg fuel pump relay,main relay etc) as if it does not it can cause feedback which causes problems(i made this mistake and the engine would not turn off when the fan was running)Steve.