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Re: Bad alternator rectifier? [Re: DennisM] #1286769
Fri Nov 09 2018 07:11 PM
Fri Nov 09 2018 07:11 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,339
State48 Ranch
Just another thought.
Depending on the pulley ratio and together with the way you wired for "one wire", can cause low output from the alternator. It would need higher RPM's to keep a gadget loaded truck battery charged and longer run cycles than just down the street and back or idling in the driveway. thanks for letting us know the results Dennis. A 40 Truck is really neat.


1960 GMC K1001 (The Oreo SpeedWagon)

All I know is what the voices in my head tell me and a little from watching TV.


Re: Bad alternator rectifier? [Re: DennisM] #1286772
Fri Nov 09 2018 07:34 PM
Fri Nov 09 2018 07:34 PM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 432
Mill Bay, BC, Canada
I suspect you have it wired wrong. In the link in my first post, the guy shows the field wire to the battery switched, so you cannot just jump #2 to the battery wire at the alternator like you can do with a Delco 10si.

I understand why you chose the more compact Denso. I'm keen to hear how it works out for you.


Gord
----
1954 1/2 ton 235 4 speed
Re: Bad alternator rectifier? [Re: DennisM] #1286779
Fri Nov 09 2018 08:54 PM
Fri Nov 09 2018 08:54 PM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,339
State48 Ranch
Gord, isn't "switched live" a battery hot? Same as hooking to any batt wire. Like straight to battery post on alt. The guy in the link is hooking up a bulb to #1 for the exiter. But as soon as the ignition switch is on, #2 has connection to battery. Is he saying that if #2 is not switched "off" it will drain the battery? Why? This fellow is confusing the issue. It does not matter if #2 is switched hot or permanent hot. The #2 to Alt hot post is much simpler. I am speaking about GM 10SI. I am assuming that #1 and #2 have the same function as a 10SI. If a Geo has some goofy alternator, all bets are off. I don't have a 1998-2001 Geo wiring diagram to check alternator hook up.

This era Geo has an ECM. Don't know if that effects wiring, alternator operation or anything were are discussing.

Dennis has not said he is trying to do a "one wire" or just wire alternator "normally". Don't know what dash meters he has or if he has a regulator and what coil.

"With the meter in series from the + bat lug to the disconnected + bat cable, I get .28A." I do not know what components and what lugs are in this test. I think it's between the alternator battery post to a disconnected positive battery cable end. Don't know if 1/4 of an amp is just static electricity in the air, or current flow or what. "In series" could mean running 12V thru the meter set on Amps? Depending on what he actually did. I guess others are saying it shows a draw where there should be none.


1960 GMC K1001 (The Oreo SpeedWagon)

All I know is what the voices in my head tell me and a little from watching TV.


Re: Bad alternator rectifier? [Re: DennisM] #1286789
Fri Nov 09 2018 11:08 PM
Fri Nov 09 2018 11:08 PM
D
DennisM  Offline OP
Shop Shark
Joined: Aug 2000
Posts: 1,310
Newport, OR
From what I'm reading here, my issue is that I can't just jumper #2 to Bat post. I moved a couple months ago and much of my stuff is still boxed as we are moving again next year. So still looking for my drawings as to how it is wired. Don't want to undo more than is needed because I have it all nice and tidy.
I get the draw only when the #2 to post is connected. I have a volt meter installed instead of amp meter. I made my test in series at the battery to the disconnected cable. The multimeter was set to measure current draw. The alternator is internally regulated. The coil is has internal ballast. I know now that isn't the best for starting and will probably change some day but works OK for me at the moment.

Dennis


40 Chevy 1/2 ton
Re: Bad alternator rectifier? [Re: bartamos] #1286826
Sat Nov 10 2018 04:44 AM
Sat Nov 10 2018 04:44 AM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 432
Mill Bay, BC, Canada
Originally Posted by bartamos

I am speaking about GM 10SI. I am assuming that #1 and #2 have the same function as a 10SI. If a Geo has some goofy alternator, all bets are off. I don't have a 1998-2001 Geo wiring diagram to check alternator hook up.

From what Dennis said and what I have read, I'm sure that the Dennis has the Denso alternator, not the Delco SI. This makes sense since the Geo is a Suzuki in disguise. The Denso wiring is different than the SI. I'm guessing that if you wire the Denso up like a SI, the current will flow through the small jumper causing a drain on the battery at all times. Dennis already proved this with his ammeter check.

Dennis: sounds like you are close to figuring this out. Looks like an interesting alternative to the SI

This might help: Toyota (Denso) alternator

Disclaimer: I haven't wired up a Denso myself; just going on what I have read.

Last edited by Gord&Fran; Sat Nov 10 2018 04:45 AM.

Gord
----
1954 1/2 ton 235 4 speed
Re: Bad alternator rectifier? [Re: Gord&Fran] #1286837
Sat Nov 10 2018 08:26 AM
Sat Nov 10 2018 08:26 AM
B
bartamos  Offline
Master Gabster
Joined: May 2005
Posts: 5,339
State48 Ranch
Originally Posted by Gord&Fran

From what Dennis said and what I have read, I'm sure that the Dennis has the Denso alternator, not the Delco SI.

What I meant when I said I'm speaking about a Delco 10SI is that I believe the two shown in Dennis' link are wired the same as a 10SI. Not that one of them was a 10SI.
The rear of the ACDELCO 3342021 is configured like type 2 of Gord's link (Westfield World.com). It has 4 connections. Has the circular receptacle with three blade terminals and a separate battery stud. I hope that this "smaller" alternator is really necessary.

At any rate Gord has provided electrical hook up for a Denso. May be the same as your Delco. The last link spends a lot of time saving 1/2 volt and discourages the "jumper thing", but is very informative.
The dead horse has been beaten.


1960 GMC K1001 (The Oreo SpeedWagon)

All I know is what the voices in my head tell me and a little from watching TV.


Re: Bad alternator rectifier? [Re: bartamos] #1286905
Sat Nov 10 2018 08:24 PM
Sat Nov 10 2018 08:24 PM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 432
Mill Bay, BC, Canada
Originally Posted by bartamos

The dead horse has been beaten.


In the stovebolt forum a dead horse is never beaten too much! smile


Gord
----
1954 1/2 ton 235 4 speed
Re: Bad alternator rectifier? [Re: DennisM] #1287072
Mon Nov 12 2018 12:31 AM
Mon Nov 12 2018 12:31 AM
D
DennisM  Offline OP
Shop Shark
Joined: Aug 2000
Posts: 1,310
Newport, OR
It's alive! For what it's worth, I checked the voltage today as suggested. At rest it is 12.92 and 14.25 running. Didn't measure the overnight discharge rate but it won't start after 5-7 days. This was just after fully charged with bat. maintainer. What gauge wire would you say is correct for the switched power? And to clarify, it is not a 10SI but is suppose to be ACDELCO 3342021 as shown as the first alternator in my link above. However, the 2nd alternator RA shows DENSO 2104147 for the same application so seems like Gord's comment apply.

Dennis


40 Chevy 1/2 ton
Re: Bad alternator rectifier? [Re: DennisM] #1287106
Mon Nov 12 2018 03:57 AM
Mon Nov 12 2018 03:57 AM
G
Gord&Fran  Offline
Shop Shark
Joined: Jul 2000
Posts: 432
Mill Bay, BC, Canada
Good for you. 14 Ga should be good enough for the switched power.

Take/share some pictures. I might want to change my generator to an alternator in the future. The Denso looks like interesting.

I'm still not clear about the pulley change. You removed the pulley for the serpentine belt and replaced it with a pulley for a v-belt. Where did you get the pulley for the v-belt?


Gord
----
1954 1/2 ton 235 4 speed
Re: Bad alternator rectifier? [Re: DennisM] #1287111
Mon Nov 12 2018 04:38 AM
Mon Nov 12 2018 04:38 AM
D
DennisM  Offline OP
Shop Shark
Joined: Aug 2000
Posts: 1,310
Newport, OR
14 it is then. Thanks. I got the pulley on e-bay. I'll have the info here somewhere and will post it tomorrow.

Dennis


40 Chevy 1/2 ton
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