anubis512 Posted February 13, 2018 Share Posted February 13, 2018 Hey guys. I've been doing an RB25DET swap into my 280z and I'm using a Wiring Specialties harness for the swap. When I finally hooked up my battery (cables already connected to the starter, no key in the ignition), the starter tried to crank. I don't know if I've missed a starting relay somewhere that I didn't see in the wiring diagrams or what. Without the key in the ignition the start signal to the solenoid shouldn't be hot, so I'm not sure why it's cranking. If i hooked up the positive & ground backwards would this ignore a start signal and crank anyway? Quote Link to comment Share on other sites More sharing options...
jthom5147 Posted February 13, 2018 Share Posted February 13, 2018 It shouldn’t be cranking if the ignition switch isn’t in the start position. The key physically in the hole doesn’t matter, only where the key has been turned to. Quote Link to comment Share on other sites More sharing options...
anubis512 Posted February 13, 2018 Author Share Posted February 13, 2018 That's what I thought. And there doesn't appear to be a starting relay or anything like that cranking. The RB swap harness was pretty simple, had a wire for starter signal that I connected from the ignition switch so I don't know what I could've messed up. Is it a sign of a broken/damaged starter? Maybe the contacts are messed up and it's getting power at the start signal contact? Quote Link to comment Share on other sites More sharing options...
jthom5147 Posted February 13, 2018 Share Posted February 13, 2018 Nope. Sounds like you connected the starter wire incorrectly or your Z wiring isn’t what you thought. Double check your wiring. Use a volt meter to wire the starter wire to something that’s only hot when the key is turned to the right position. Quote Link to comment Share on other sites More sharing options...
anubis512 Posted February 13, 2018 Author Share Posted February 13, 2018 The starter gets positive and ground directly from the battery and a start signal from the ignition. If I remove the start signal wire completely, it still starts cranking once power is connected to it...that's gotta be a damaged starter no? Regardless of the cars wiring, the starter shouldn't do anything w/o a start signal. Quote Link to comment Share on other sites More sharing options...
ZHoob2004 Posted February 13, 2018 Share Posted February 13, 2018 If you disconnected the starter solenoid from all power and it still turns over, then yes it sounds like your starter has problems (or more specifically, the solenoid is probably stuck closed) Quote Link to comment Share on other sites More sharing options...
illusioneclipse Posted October 10, 2018 Share Posted October 10, 2018 Did you find out what the problem was? Quote Link to comment Share on other sites More sharing options...
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