another one wire alternator question!!

[m_m70]

battery measures a full 12 volts

Is that 12v with the engine running? When I measure voltage at the battery cables with the motor running and alternator charging, I get between 14 & 14.5v. If you're only getting 12v I don't think your alt is charging...

 

[ba123]

You should get slightly more than 12v with engine off on all 12v circuits and 13.5-14.5 with engine running as said.

If you’re getting less than 12 when your battery is 12v, then there is something wrong or a resistor you don’t want.

 

[Oldtimer]

Having followed this whole thread, I would start looking at ground wire connections.

 

[maxwedge5281]

i believe that i will wire the positive post on the coil using the red/green wire at the vr. and skip the brown wire at the relay. i am positive that my alternator is charging ...shows 14v-14.5v with motor running and battery shows 12v across terminals. if i am loosing voltage to the coil it most likely is in the wiring?

 

[maxwedge5281]

i wired the coil directly from the red/green wire at the vr and i have a full 12v at the positive terminal on the coil with switch on. the engine revs smoothly and i had no popping in the exhaust. this has been a truly enlightening experience and thanks for all the help...classic bronco forums the best!!!

 

[DirtDonk]

That’s great!. But you’ve still got a voltage loss somewhere important. Unless that last statement was a typo?
With the engine running and you seeing 14 to 14.5 V at the alternator, you should be seeing exactly the same at the battery.
If not, you need to find out why.

 

[m_m70]

With the engine running and you seeing 14 to 14.5 V at the alternator, you should be seeing exactly the same at the battery.

Hoping it's a typo..........

Glad you seem to be up and running smoothly!

 

[ba123]

That’s great!. But you’ve still got a voltage loss somewhere important. Unless that last statement was a typo?
With the engine running and you seeing 14 to 14.5 V at the alternator, you should be seeing exactly the same at the battery.
If not, you need to find out why.

+1 on that. Should be the same.

 

[maxwedge5281]

the 12v at the battery was with the engine not running. i just checked and with the engine running i get between 14 and 14.5 volts. thanks for pointing that out.

 

[m_m70]

Well that's great then! Sounds like your all good!