fd alternator problems...
09-05-10, 10:12 PM
#1
fd alternator problems...
Ok guys i have a 89 TII which has a supposed to be new fd alternator on it...Problem is when you first crank the car the alternator dosent put any voltage out untill you unplug the electrical connector and plug it back in. After you do that the alternator kicks in and charges good for a little while or untill you drive it a little then it stops charging again..You can keep repeating this procedure for awhile untill it gets to where that dosent even work anymore and you have to wait till the next day...What would cause this?? Voltage regulator maybe???
My battery is relocated to the rear storage bins and is done correct as ive went throu it to double check...optima yellow top battery that is about 4 years old...
thanx
My battery is relocated to the rear storage bins and is done correct as ive went throu it to double check...optima yellow top battery that is about 4 years old...
thanx
09-06-10, 06:08 PM
#6
One other thing I forgot to mention was do the idiot lights light up w/key to on but engine off and then turn off w/key to on but engine running? Since turbos don't have voltage gauges, correct me if I'm wrong, then how do you know when the alternator is putting out or not. If you wired up an aftermarket unit then are you measuring the voltage output at the alternator with a multimeter as well and comparing the two readings?
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09-06-10, 09:26 PM
#12
Excessive voltage or just the opposite would be the symptoms. When you check the alternator and you see that it is not putting out check the S terminal to verify that it is still sending 12 volts on it. With respect to the plug make sure the two wires are firmly inserted into the back of the plug and not pulled back such that a faulty connection is occuring. Also, check the metal components inside the plug to make sure they are grabbing the alternator prongs firmly as opposed to barely hanging on.
09-07-10, 06:38 PM
#14
ok update...went and cranked the car today...and the alternator was putting out 16.5-17 volts right off the bat...i let the car run for about 5 minutes then it just randomly quit charging...i tried unplugging the electrical plug to make it charge again and this had no effect...and the s terminal did have battery voltage at the time when it wasnt charging...also when i first cranked the car and it was charging so much i unplugged the electrical plug and this made no difference it was almost 17 volts with the plug on or off....
09-07-10, 07:09 PM
#15
The W/B wire should have 1 to 3 volts while plugged in and key to on but car not running. You'll have to back probe this wire for results. Also, this wire should have 12 volts on it while the car is running. If it does both then the problem is not the wiring but the alternator itself.
09-09-10, 06:17 PM
#18
mazda mario
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its a ground issues i have the same problem as we speak for me it the grounds under the dash by the way does anyone know where is the ground locations under the dash
09-09-10, 08:14 PM
#21
With the car running and the multimeter set to DC volts place one meter terminal on the casing/housing of the alternator and the other meter terminal to the negative battery post (not clamp) and the reading should be about .2 volts or less. If it is then the grounding is fine. Poor connection(s) related to grounding causes resistance along the wiring which leads to voltage drops and not voltage increases. Also, placing a meter lead to the B+ terminal and the other lead to the positive battery post (not clamp) should read .2 volts as well. If not, then the wiring needs to be cleaned up.
There aren't any grounds under the dash related to the charging circuit except for the alternator warning light, which that particular grounds purpose is to only turn the warning lights on or off in certain instances but it does nothing else.
There aren't any grounds under the dash related to the charging circuit except for the alternator warning light, which that particular grounds purpose is to only turn the warning lights on or off in certain instances but it does nothing else.
09-09-10, 08:38 PM
#22
mazda mario
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well u know that cpu( fb01)on the driver side kick panel,, i turn on the car and theres no alternation but when i move the plug the one on the front when u are looking at it , it kicks ,and then theres alternation
thats why i want to know the locations of ground under the dash for i can clean them , ive looked at the fsm already doesnt show wheres the ground under the dash
thats why i want to know the locations of ground under the dash for i can clean them , ive looked at the fsm already doesnt show wheres the ground under the dash
09-09-10, 09:12 PM
#23
well u know that cpu( fb01)on the driver side kick panel,, i turn on the car and theres no alternation but when i move the plug the one on the front when u are looking at it , it kicks ,and then theres alternation
thats why i want to know the locations of ground under the dash for i can clean them , ive looked at the fsm already doesnt show wheres the ground under the dash
thats why i want to know the locations of ground under the dash for i can clean them , ive looked at the fsm already doesnt show wheres the ground under the dash
09-09-10, 09:31 PM
#25
EDIT: http://www.johnr.com/rx7faq/faq3.html
