496 no start electrical issue
#1
496 no start electrical issue
I cannot get my 2007 496 to start. The starter relay will not operate with the key. It will roll over if i cross the relay. I swapped relays and it does the same thing. I get 12 volts on the yellow/red to the relay from the key when using the battery ground. But if I check with the ground going to the relay i only get 7 volts. My mechanic buddy and I have tested the shift switch and neutral switch and they are good. We put a jumper from the ground stud on back of the motor to the relay ground and the motor would then roll over with the key. I never tried to start the motor with the jumper. From what we can tell without a wiring diagram the ground for the relay comes from the computer. I installed vessel view to the motor and have no fault codes. The motor ran great last year. I pulled it end of the year to change the rear motor mounts and have the fuel injectors flow tested. I just put the motor back in last week and been having this problem since.
#2
Gold Member
Gold Member
I cannot get my 2007 496 to start. The starter relay will not operate with the key. It will roll over if i cross the relay. I swapped relays and it does the same thing. I get 12 volts on the yellow/red to the relay from the key when using the battery ground. But if I check with the ground going to the relay i only get 7 volts. My mechanic buddy and I have tested the shift switch and neutral switch and they are good. We put a jumper from the ground stud on back of the motor to the relay ground and the motor would then roll over with the key. I never tried to start the motor with the jumper. From what we can tell without a wiring diagram the ground for the relay comes from the computer. I installed vessel view to the motor and have no fault codes. The motor ran great last year. I pulled it end of the year to change the rear motor mounts and have the fuel injectors flow tested. I just put the motor back in last week and been having this problem since.
#5
Thank you for listening to my issue I know your time is valuable. But the fuse was not my issue because it doesn't have one. I will be ordering one tomorrow for it. I will mention i found 5 volts on the black/yellow to the relay to good ground. I have 7 volts when I measure across the relay with the key on....that would be from the black/ yellow to yellow/black, which starts out as yellow red at the key. It changes color through the cannon plug. I get the 5 volts on the black/yellow to ground when I turn the key switch to on and to start. And I get just over 12 volts when I measure from the yellow/black key on to good ground.
Last edited by chartersj; 06-16-2019 at 06:40 AM.
#6
Turns out it was my smart craft harness. I unplugged it when I pulled the motor last fall and set it on the bench . Its one plug on the top of the motor that branches off to a few smaller ones if you use smart craft, which I don't so none of the plugs go to anything. Well i plugged it back in just to try it and it rolled over lol. Primed the fuel system and she came to life after 8 1/2 months.
#7
Banned
iTrader: (9)
and thats why I said do not send me your pcm until you do some more testing because I had a feeling your issue was somewhere else. If I was all about the money I would of said sure send it in and Ill test and charged for all my testing time.. Glad you found the issue. And like I said voltage issues are usually on the owner but can cause problems elsewhere. Take care
#8
and thats why I said do not send me your pcm until you do some more testing because I had a feeling your issue was somewhere else. If I was all about the money I would of said sure send it in and Ill test and charged for all my testing time.. Glad you found the issue. And like I said voltage issues are usually on the owner but can cause problems elsewhere. Take care