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Old 12-27-2013, 05:00 PM   #1
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Default MS3 and MS3X wiring questions

I have 97 with a 99 Engine and 99 sensors.
(97 AC, PS and Alternator)
(99 Crank Sensor and 99 CAM Sensor)
LS2 Truck coils, ID 1000 injectors.

I bought Megasquirt MS3X ecu with diyautotune pigtail from a member here. It is configured for full sequential. He build a PnP harness to connect the MS3X to my 97 Harness.

When reviewing the pigtails, I am not sure if it is wired correctly. Looks like the wires are crossed or I am not looking at it correctly.

Also all the four AC related connectors (AC In, AC Out, Main Fan, AC Fan) are connected to a single wire from MS3X (MS3X - 1). Is this correct?

I have attached the diagram that explains better.

Please help.

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MS3 and MS3X wiring questions-wrong.jpg  
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Old 12-27-2013, 10:07 PM   #2
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you are looking at the connector from the wrong side. those pins are for when you are looking into the pins where the connectors actually go. please match number of pins

if you got that picture from westfield (frank's) website, then he has the picture of the connector right next to it in his build page showing the orientation of the connector
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Old 12-28-2013, 12:48 AM   #3
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Quote:
Originally Posted by bmxfuel007 View Post
you are looking at the connector from the wrong side. those pins are for when you are looking into the pins where the connectors actually go. please match number of pins

if you got that picture from westfield (frank's) website, then he has the picture of the connector right next to it in his build page showing the orientation of the connector
OK. I got the orientation correct now. I am still confused about why MS3X -1 is connected all 4 of the AC pins [ MS3X-20, MS3X-30, MS3X-4 and MS3X-1 ].
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Old 12-28-2013, 05:12 AM   #4
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yeah, when I did the wiring for my cousin's 96, I'm sure I only connected MS3X-1 to 1A
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Old 12-28-2013, 12:03 PM   #5
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because whomever built your MS did a completely **** job making that harness and had no idea what they were doing?


If I had that harness, I'd cut off every wire and start over.
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Old 12-28-2013, 11:28 PM   #6
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^agreed
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