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#1 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Strange power issue, help?
Got a weird one.
I went to a 1-wire alternator. It's been a couple months since I wired this up, but I had two wires going from the fuse block to the rad support: 1) went to the voltage regulator 2) went to the headlights I assumed that both would be either a) getting power FROM the battery or b) providing voltage levels TO the cluster (and fuse box). Apparently I may have been wrong on those assumptions. Now, when I attach the positive battery cable with the key OFF, I see the following: * "Generator" dummy light comes on. When key is put into "ACC" position, the Generator light turns off. That's backwards of what it should be. * Radio has 'half' power. When I say "half power", I mean, it comes on and the tuner works, but tapes won't put out sound until I put the key in ACC position - almost like it's not getting a full 12v until key is in ACC I haven't fried anything yet, I'm just clueless as to what I did wrong. Has anyone seen anything else like this? It's almost like there is 6v of power when key is OFF, and 12v of power when key is ON. For the record, I have a ground strap from the battery to the inner fender, ground strap from bed to frame, and ground strap from cab to frame. I don't have my strap on from the block to fram or block to body yet, but I'm not sure one missing ground strap would do this. Any advice is appreciated!
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#2 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,894
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Re: Strange power issue, help?
I think you have to cut the brown wire on the back of the ignition switch. I haven't done/finished my wiring, but told that I needed to remove/cut one wire.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#3 |
On the fast track to nowhere..
Join Date: May 2006
Location: Splendora, Texas
Posts: 5,316
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Re: Strange power issue, help?
I had the same problem with my truck but it's been so long I can't for the life of me remember what I did to fix it. I need to start writing this crap down.
__________________
-Mike Owen- Norwood, Houston, Cecilia, Jackson, Monroe and counting |
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#4 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,894
|
Re: Strange power issue, help?
Don't you need to add a resistor in the wiring for the alternator also?
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#5 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: Strange power issue, help?
I don't think I need a resistor for the LS1 alternator on the LS1 engine.
Basically, there are only three power wires: 1 to from alt->batt 1 from starter->batt 1 from batt->interior I think the brown wire was the one that went from the bulkhead->voltage regulator, so I will track down that wire tonight and cut it, see what happens.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#6 | |||
Union Electrician
Join Date: Feb 2005
Location: Louisville, Ky.
Posts: 3,356
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Re: Strange power issue, help?
Doesn't the tan wire control the dummy light or send signal to the ammeter? I know it is brown or blue, can't remember right now which ine it is.
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#7 |
Registered User
Join Date: Oct 2006
Location: Cedarville, OH
Posts: 61
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Re: Strange power issue, help?
The tan wire goes to the dash, the blue wire goes to the alternator. You splice them. The tan wire is a smaller gauge and acts as its own resistor.
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Caleb |
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#8 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: Strange power issue, help?
Does the tan wire power the entire dash? Because I'm getting partial power on the cigarette lighter while the 'generator' dummy light is lit.
I still can't figure out why the 'generator light' would stay lit UNTIL the key is turned to ACC position, either.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#9 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
|
Re: Strange power issue, help?
Bill, you are the man! I went in and looked at things tonight before firing the engine up, and after unravelling the wire bundle, I noticed that there was a thin brown wire I'd spliced in there - I cut it, and all of my electrical woes went away. Apparently, that needed to be hooked up to a switched outlet. Basically, I was dumping battery power into the dash
![]() So, yep, when moving to a one-wire alternator, if you have the non-tach/non-vacuum dash, I would just delete the brown wire. I owe you one, Bill ![]()
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#10 |
On the fast track to nowhere..
Join Date: May 2006
Location: Splendora, Texas
Posts: 5,316
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Re: Strange power issue, help?
Glad you got it figured out!
__________________
-Mike Owen- Norwood, Houston, Cecilia, Jackson, Monroe and counting |
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