Geevs Posted August 4, 2014 Report Share Posted August 4, 2014 My car has been having an ongoing electrical issue for over a year when I accelerate hard the instrumentation panels lights up like a christmas tree but the RPM and speedo are unaffected and the car continued to run fine and didn't go into limp mode. Then recently it happened again but this time the RPM and speedo dropped dead to zero and the car started to stumble badly but not stall. So I pulled over and turned off the engine. But it would not start again like the battery was dead. Managed to get the car home with a spare battery but it seems that it got drained as well when I got home as the car would not start. After fully recharging the battery and getting the car started again, I tested the alternator with a multimeter on the battery terminals itself with the car running. At idle, the reading is steady at 14.2V. At 2K RPM, the voltage momentarily drops to 13.2V and then goes back to 14.2V. So I'm wondering if it's the alternator, battery cables and/or ignition switch. The switch was replaced around 10 years ago when I bought the car from the previous owner. Thanks! Link to comment Share on other sites More sharing options...
volvoguy23 Posted August 4, 2014 Report Share Posted August 4, 2014 14.2 is little higher then normal, what's the voltage at say 4k rpm? May be the pnp switch and/or fuel pump relay. Try rowing thru the gears 30-40 times to clean the contacts in the pnp switch. Could also be voltage regulator going bad causing high voltage maybe. Idk those are some weird issues Link to comment Share on other sites More sharing options...
Geevs Posted August 4, 2014 Author Report Share Posted August 4, 2014 Thanks for the reply. The car is a 5-speed manual. How do I test for the fuel pump relay? Is the voltage regulator part of the alternator? Link to comment Share on other sites More sharing options...
volvoguy23 Posted August 4, 2014 Report Share Posted August 4, 2014 I would just throw a used one in there from your local jy, you can take the relay out and use a jumper wire to run the pump but it will be on constantly.... Kinda like an emergency sorta fix. The voltage regulator is on the alternator and can be replaced seperately... But it may not be bad. Replaced your relay and go from there. Link to comment Share on other sites More sharing options...
toasty Posted August 5, 2014 Report Share Posted August 5, 2014 Check your grounds, specifically the one under the battery thats bolted to the frame. Might help to remove and sand down/wire brush the bolt, frame, and gound winglet. Link to comment Share on other sites More sharing options...
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