taaron Posted March 25, 2019 Share Posted March 25, 2019 Hey guys, wondering if anyone has run into this problem. I recently started rewiring my car after doing an engine out restoration. Plugging in the old MS 2 3.57 w/ relay board, and all the associated wires. I've found a problem where I was getting voltage on my ground (on the relay board). I was able to narrow it down to the Tach In terminal on the relay board. If I disconnect it, everything grounds right, if I plug it in, I can read 12V at my ground. Anyone have any idea what may be going on here? It does it even when the distributor wire is removed from the distributor. (Also I know the relay board is sacrilege, however I have it and its worked in the past, dont have the funds to upgrade past it at the moment). Quote Link to comment Share on other sites More sharing options...
taaron Posted March 26, 2019 Author Share Posted March 26, 2019 In case anyone was curious, I solved it by unplugging all my wires and replugging them back in. I also ran the relay board ground to the battery instead of the block. Everything works and the car fired for the first time in a year! Quote Link to comment Share on other sites More sharing options...
jhm Posted March 26, 2019 Share Posted March 26, 2019 Wonder if it just needed a reboot, essentially? Glad you got it worked out. Quote Link to comment Share on other sites More sharing options...
taaron Posted March 26, 2019 Author Share Posted March 26, 2019 Yeah, not sure if it needed the reboot or I did hahaha. Quote Link to comment Share on other sites More sharing options...
gmorrone1214 Posted July 25, 2019 Share Posted July 25, 2019 On 3/25/2019 at 6:18 AM, taaron said: Hey guys, wondering if anyone has run into this problem. I recently started rewiring my car after doing an engine out restoration. Plugging in the old MS 2 3.57 w/ relay board, and all the associated wires. I've found a problem where I was getting voltage on my ground (on the relay board). I was able to narrow it down to the Tach In terminal on the relay board. If I disconnect it, everything grounds right, if I plug it in, I can read 12V at my ground. Anyone have any idea what may be going on here? It does it even when the distributor wire is removed from the distributor. (Also I know the relay board is sacrilege, however I have it and its worked in the past, dont have the funds to upgrade past it at the moment). So my build I used the relay board and did not wire directly to the DB37 main harness. However, I actually had to separate the tach wire grounds (pin 1 and 2) from the sensor grounds on pin 17 or 18 cant remember which I used. Reason being I was getting noise introduced into TPS sensor from the ground of the TACH. It was so bad that it was always activating my AE. However, I was using the relay board and from that wiring diagram, the relay board does route them to pin 1-2 but rather with all the sensors (TPS, CLT, IAT), causing issues. Quote Link to comment Share on other sites More sharing options...
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