I am working on putting on the Hei and coil relay (Thanks Dan!)
and I wanted to check the voltage first. With the key on , the votage to battery is 12.59V and alternator was 12.36V . With the engine running the battery shows 14.05V and the alternator shows 14.36V.


Thanks
Dave

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81 Dodge D150
It looked easier in the book .

Voltage at the battery with engine off looks good.
Voltage at the alternator with the engine on looks good.

Does the ammeter on your dashboard work? If not — and I'm guessing probably not; they're a weak design — run a 10ga wire from your alternator B+ (output) terminal to the battery positive terminal to reduce the voltage drop between the alternator and the battery.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yes the ammeter does work, it has a little movement, but barely.
If I do run the 10ga wire from battery to B+ alternator , do I disconnect the wire that is on the alternator B+ terminal now.

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81 Dodge D150
It looked easier in the book .

Nope, don't disconnect any existing wires — just add the additional new one.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Don't forget to add a fusable link on the end of the extra wire, right at the end to where you connect it. I connect mine to the stud on the starter relay.

Your talking about the wire I am connecting to the relay from a power source . I think it should be a 15a fuse if I remember what I read. Should I put one on, If I run a wire from the battery to the alternator as Dan suggested also.

Thanks

Dave

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81 Dodge D150
It looked easier in the book .

sorry to resurrect an old thread, but i thought any voltage under 12.9 in a battery was bad. Is it different in modern cars?

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What's that fuzzy blue thing being hurled this way?
::stick::
BOOSH!!!

A fully-charged "12-volt" battery will read 12.6 to 12.8 volts once the surface charge is knocked off (if the car's been running or the battery's been on a charger, the surface charge can be taken off by putting on the high beam headlights for 90 seconds or so with the engine off and/or charger disconnected).

_________________
一期一会
Too many people who were born on third base actually believe they've hit a triple.

cool thanks

_________________
What's that fuzzy blue thing being hurled this way?
::stick::
BOOSH!!!