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Old 06-13-2019, 05:52 PM   #1
ryan.of.peachey
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Weird Main Relay Issue

'88 325i vert. Engine only starts/gets spark when I jump the main relay, it won't start with the actual relay installed. I've tried two brand new relays (both are OEM) and neither work. Is it really possible I bought two bad relays? What else could be causing this problem? Thanks.

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Old 06-13-2019, 07:20 PM   #2
digger
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Test the relay pins using 9v battery or similar and see if it switches correctly
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Old 06-14-2019, 08:43 AM   #3
ryan.of.peachey
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I'll try that. Just wondering what else it could be. I'm stumped.

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Old 06-14-2019, 12:29 PM   #4
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If you know putting power from #30 to #87 lets the car run, I would focus on #85. I think that is the ground signal form the ecu?? Wiring diagram says its a green wire from the MCU called the "Main Relay Control"
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