Jords Posted September 16, 2017 Posted September 16, 2017 Hi Today after driving for about 30 minutes my 240z started missing. I noticed that the Amp guage was reading +45. After a minute I heard a click, the amps went back to the right side of the middle (like normal) and the car went back to running normally. Any ideas? Thx in advance. Quote
Linton Posted September 16, 2017 Posted September 16, 2017 from your description its possible that voltage regulator might have a problem but if it is going ok a bit hard to diagnose anything until it fails again. if it has an external reg you could remove the cover and check if the contact points are ok if they show signs of arcing might be safer to replace it. it may well be an alternator short as well, that's where i would start. gav240z 1 Quote
GregTas Posted September 16, 2017 Posted September 16, 2017 (edited) If you have original charge circuit with separate regulator for alternator then could be issue with relay in voltage regulator. If not working prperley then there is full current to the field winding in alternator and it will charge flat out.Then relay senses high voltage and switches off. As intermittent check plug on regulator and alternator first. Then use volt meter to check charge rate at battery. Linton we were both typing at the same time. We were thinking the same thing Edited September 16, 2017 by GregTas gav240z and Linton 2 Quote
Administrators gav240z Posted September 16, 2017 Administrators Posted September 16, 2017 Is it the original voltage regulator? Mine was replaced many moons ago.. Quote
GregTas Posted September 16, 2017 Posted September 16, 2017 (edited) If it is original regulator far better replacing with a new electronic one. Much better voltage regulation than the old relay switching in and out. Just thinking interesting the car was missing. If the car was overcharging you wouldn't expect it to be missing. The coil wouldn't notice the slightly higher voltage. Another possibility is there was a dead short somewhere puling the battery voltage down. This would get the alternator charging flat out and if the voltage was down the lo w coil voltage could lead to a misfire. I've seen this happen before, but you wouldn't expect a short to fix it self. Edited September 16, 2017 by GregTas Quote
Jords Posted September 16, 2017 Author Posted September 16, 2017 Thanks guys. I will check the regulator. I drove the car for another 3 hours over bumpy windy roads and it ran with no issues. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.