Hello,
I just finished my ms2 build and I have 10' megasquirt main board wiring harness.
Problem: while double checking all the pins with diagram came the harness and labeling them for easy installation, I noticed that diagram indicates 30 wires while harness has only 28
Missing: wire on pin #1- ground for crank position sensor(hall) And...
Wire on pin #2 - not what does. The diagram shows it looped around the sheilded pair crank position ground for VR circuit (which I'm not using).
Any help would be appreciated.
Will
Wiring harness
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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.
Re: Wiring harness
Pins 1&2 and 7-19 are all ground pins connected to the ground plane on the PCB. Which one is used for what doesn't much matter.
The important thing is to use at least four pins and suitable cables for the main ground to the engine block.
And to run all the signal grounds - TPS, ATS. CTS, crank sensor etc to different ground pins.
So that with the MS unplugged, the sensor grounds are not connected to ground - that must only happen when the MS is plugged in.
The problem with any universal loom is it may not suit your installation exactly, so need some adapting.
The important thing is to use at least four pins and suitable cables for the main ground to the engine block.
And to run all the signal grounds - TPS, ATS. CTS, crank sensor etc to different ground pins.
So that with the MS unplugged, the sensor grounds are not connected to ground - that must only happen when the MS is plugged in.
The problem with any universal loom is it may not suit your installation exactly, so need some adapting.
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
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ironwill11
- Helpful Squirter
- Posts: 48
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Re: Wiring harness
So you are saying that I can connect those to the other ground wires. I just did not understand why the instructions that they give you would suggest to connect to pin #1 when there is no wire connected to pen #1 in the harness.
Will
Will
Re: Wiring harness
Yes it often confuses. I dunno how many ground wires your loom uses, and if they are all the same colour. But choose just one and use than for all the signal grounds. Run all the others to the engine block.ironwill11 wrote:So you are saying that I can connect those to the other ground wires. I just did not understand why the instructions that they give you would suggest to connect to pin #1 when there is no wire connected to pen #1 in the harness.
Will
Dave P, London UK.
Rover V-8
MSII V3
EDIS
Tech Edge Wideband
Rover V-8
MSII V3
EDIS
Tech Edge Wideband