I'm sold on DeOxIt for any electrical contact cleaning and protection. I discovered the stuff when working in a TV Repair Shop back in the late 1970s, and it is amazing. Never had to scrub the most oxidized contact; just spray/soak.
Charging system over voltage!?!
- Thread starter wsutard
- Start date
wsutard
Well-Known Member
I still have the overcharging issue. Here is what I have done to date.
1. checked continuity of the blue and green wire connecting the VR to the alternator. They had continuity between the alternator and the VR side of the wire. They did not have continuity from the wire to a ground on the block. This means they are not being pinched by anything. There are no other obvious pinches anywhere.
2. removed the VR connector and checked the voltage at the wires and compared it to the battery voltage. They were 12.09 and 12.38.
3. Removed the VR and noticed it had a burnt spot on the back side, which was translucent. Swapped it for an old VR that my buddy had and it still produced the overcharging.
Next steps: purchase a new VR (1970) from local parts store to ensure it isnt the cause.
After that, test the battery to see if it has damage.
1. checked continuity of the blue and green wire connecting the VR to the alternator. They had continuity between the alternator and the VR side of the wire. They did not have continuity from the wire to a ground on the block. This means they are not being pinched by anything. There are no other obvious pinches anywhere.
2. removed the VR connector and checked the voltage at the wires and compared it to the battery voltage. They were 12.09 and 12.38.
3. Removed the VR and noticed it had a burnt spot on the back side, which was translucent. Swapped it for an old VR that my buddy had and it still produced the overcharging.
Next steps: purchase a new VR (1970) from local parts store to ensure it isnt the cause.
After that, test the battery to see if it has damage.
Sounds like a plan. But you always have to remember that a lot of 'new' stuff doesn't work either; "We" never had to worry about this parts thing years ago as everything from the parts guys always worked-sad state of affairs.
Ranger16
Well-Known Member
I would agree.
Too much stuff made out of chineseium today.
Wietse
Well-Known Member
Yep, I got the roughly the same readings after replacing the voltage regulator.
As you measured the difference of voltage between the battery voltage and the voltage on the VR, this should be as low as possible.
You measured out at 0.29 V, but lower is better obviously for the VR to get the correct reference.
If the difference gets too big the alternator will be charging while it does not need to and boil the battery.
The old VR's are mechanical style while the "new" types, which look stock, have modern electronics inside.
I have a new mechanical style installed at the moment but I ordered a "electronic" version as well so I will try and compare if this makes a difference in voltage.
As you measured the difference of voltage between the battery voltage and the voltage on the VR, this should be as low as possible.
You measured out at 0.29 V, but lower is better obviously for the VR to get the correct reference.
If the difference gets too big the alternator will be charging while it does not need to and boil the battery.
The old VR's are mechanical style while the "new" types, which look stock, have modern electronics inside.
I have a new mechanical style installed at the moment but I ordered a "electronic" version as well so I will try and compare if this makes a difference in voltage.
wsutard
Well-Known Member
Thanks everyone. Now that it's back up and running I am going to order up some colored wires and start on building a new harness. I'm going to upsize the wires and go with 8ga for the alternator wire.
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