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Jerry Cochran
Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR
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 Posted: Thu Mar 08, 2007 8:28 am Post subject: Alternator field current |
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Folks,
I may be having a brain lockup, but trying to determine field current for
the old 14184 type Van's alternator. I just began running my engine for the
first time, and thought I had it wired per Z-11. I had inserted a 5a fuse onto
the field circuit at the bus because I thought this would be equivalent to
inserting one inline after the switch as Z-11 shows instead of the 22AWG
fuselink. Z-11 looks like this circuit has double protection with the fuselink and
5a fuse on the same circuit
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nuckollsr(at)cox.net
Guest
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| Posted: Fri Mar 09, 2007 5:47 am Post subject: Alternator field current |
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At 11:27 AM 3/8/2007 -0500, you wrote:
| Quote: |
Folks,
I may be having a brain lockup, but trying to determine field current for
the old 14184 type Van's alternator. I just began running my engine for
the first time, and thought I had it wired per Z-11. I had inserted a 5a
fuse onto the field circuit at the bus because I thought this would be
equivalent to inserting one inline after the switch as Z-11 shows instead
of the 22AWG fuselink. Z-11 looks like this circuit has double protection
with the fuselink and 5a fuse on the same circuit
.
Well, upon first start, the 5a fuse on the buss blew, so I have two
questions for Bob and/or other smart people on this list.
1) Why the "extra" protection on the field circuit?
|
The wire running from the bus to the switch
and breaker is an extension of the bus. This
wire is at very low risk of being faulted and
not having protection. The protection needs
to have a response time sufficiently long
to allow the downstream breaker to do its job
if called upon . . . hence the fusible link.
| Quote: |
2) What typically would the current draw be on the field circuit for this
35a alternator. I checked the archives and manuals, no joy...
|
2.5 to 4 amps depending on the design. I presume
that the alternator IS designed to run with
an external regulator? When the engine is
running and loads on the system are light, the
field current can drop below 1A.
| Quote: |
BTW, if it matters, this is the "Generic Ford" regulator as per Z-11
|
Did you add the ov protection too? If, except
for the (fusible link substitution) you're wired
exactly like Z-11, I'd recommend that you install
the fusible link and the put an ammeter in this
lead to see what the real static current (engine
stopped) is for he field circuit and report back
to us.
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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Jerry Cochran
Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR
|
| Posted: Sat Mar 10, 2007 10:22 am Post subject: Alternator field current |
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Bob & List
Remarks embedded...
In a message dated 3/9/2007 5:46:25 A.M. Pacific Standard Time, nuckollsr(at)cox.net writes:
| Quote: | At 11:27 AM 3/8/2007 -0500, you wrote:
| Quote: |
Folks,
I may be having a brain lockup, but trying to determine field current for
the old 14184 type Van's alternator. I just began running my engine for
the first time, and thought I had it wired per Z-11. I had inserted a 5a
fuse onto the field circuit at the bus because I thought this would be
equivalent to inserting one inline after the switch as Z-11 shows instead
of the 22AWG fuselink. Z-11 looks like this circuit has double protection
with the fuselink and 5a fuse on the same circuit
.
Well, upon first start, the 5a fuse on the buss blew, so I have two
questions for Bob and/or other smart people on this list.
1) Why the "extra" protection on the field circuit?
|
The wire running from the bus to the switch
and breaker is an extension of the bus. This
wire is at very low risk of being faulted and
not having protection. The protection needs
to have a response time sufficiently long
to allow the downstream breaker to do its job
if called upon . . . hence the fusible link. |
NOW I understand... Thanks!!
| Quote: |
| Quote: |
2) What typically would the current draw be on the field circuit for this
35a alternator. I checked the archives and manuals, no joy...
|
2.5 to 4 amps depending on the design. I presume
that the alternator IS designed to run with
an external regulator? When the engine is
running and loads on the system are light, the
field current can drop below 1A. |
The alternator is from the AV dep't of Autozone, appears to be same as the 35A one from Van's with the identical 14184 part #, so I assumed it needed external regulation, as does theirs.
Could it possibly be IR? Not at the hangar, so can't look.
| Quote: |
BTW, if it matters, this is the "Generic Ford" regulator as per Z-11
|
Did you add the ov protection too? If, except
for the (fusible link substitution) you're wired
exactly like Z-11, I'd recommend that you install
the fusible link and the put an ammeter in this
lead to see what the real static current (engine
stopped) is for he field circuit and report back
to us.
Bob . . .
Yes, I did use OV from B&C and as I said, only put the 5a fuse on the main buss, not just before the OV as per Z-11. Don't recall why, but I deleted the fusible link... Probably simply an error.
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
Bob, Thanks so much for all you do.
Jerry Cochran
AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.
[quote][b]
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