Hello I am new to buick's, I recently inherited my grandfathers 70 Lasabre it has a 350 in it. My problem I'm having is the gen light is on while running and alt. is not charging I put a new alt, Batt, Voltage reg. I have a blue wire and a yellow wire coming from the alt. that go into the wiring harness. The same wires come back out the wiring harness in the same location and go nowhere they are not connected to anything. I'm sure this is my problem but not sure where they connect to. Can anybody please help me out.
I'm looking at a wiring diagram for a 67 LeSabre (I've also looked at a wiring diagram for a 72) - they are the same "coloring". I couldn't find a diagram for a 70. There are three wires from the alternator: Red, Dk Blue, and White. Red goes to battery +. Dk Blue and White go to the Voltage Regulator. My 64 LeSabre has the same wiring colors as you: Yellow goes to "R" (alternator side) and Blue goes to "F". At the Voltage Regulator side, Blue goes to "F", Yellow to "2". The important thing is wire alternator "F" to Volt.Reg. "F" and alternator "R" to Volt.Reg. "2".
Ok I just traced the wires from Alt. I have the red to the Batt. term. on starter. Blue and yellow are going to vol. reg. threw harness then from vol. reg. I have a blue and a yellow going back into harness and coming out by alt. not connected to anything. I'm thinking they have to go to the starter to complete the loop back to the batt.
No,the blue & yellow are feeds FROM the regulator.Do not hook them to the starter!MJT posted how they hook up,you might want to buy a service manual for the car.They are worth the money.:TU: BTW,it's LeSabre not LaSabre!
I'm looking at the wiring diagram. If you "think" they should "go to the starter to complete the loop back to the batt.", then go for it. But what you'll do is rwong - you came out asking what the wiring should be and now you're saying you know how it should be? I told you how it should be wired, based on the wiring diagrams I'm looking at *and* at how my car is wired. ((sheesh)) Alternator (yellow) "R" <==> VR "2" Alternator (blue) "F" <==> VR "F"
I understand that the yellow and blue go to the vr. That side of car is fine yellow and blue are connecter to vr. the wires that i am questioning are a yellow and blue not connected to anything coming out of the main harness behind alt. I'll try to post pic's later if that will help.
This might be a simple misunderstanding. The blue and yellow wires should be connected to the alternator. Yellow to R and Blue to F. Sometimes its best to start with the obvious. I hope this helps. John
I know this sounds confusing I have the blue and yellow hooked to alt. I also have a second set of blue and yellow in the same location. From the harness behind alt I have a green going to temp sensor,red blue and yellow going to alt, red going to coil, two bigger gage reds and a black going to starter. Then the extra blue and yellow that is in question. I have searched for a wiring diagram and cant find one nor can I find a manual with a good wiring diagram.
So, in your original post: "... I have a blue wire and a yellow wire coming from the alt. that go into the wiring harness. The same wires come back out the wiring harness in the same location and go nowhere ..." When I read, "the same wires come back out", I thought you meant the exact same wire-pairs, as if they were "looped back". What you're saying is you have an EXTRA (a 2nd set of) wire pair that are coming out of the harness. On the 2nd set of blue/yellow wire-pair ... does it have a connector just like the connector that is plugged into the alternator? Here's what I'd do ... I'd get a multi-meter and check for continuity from alternator blue to volt.reg. blue and then alt. yellow to v.r. yellow. Check both wire-pairs and see which pairs show continuity. Maybe the wrong blue/yellow pairs are plugged into the alternator. TeamBuick.com has wiring diagrams in the "Reference" section: http://www.teambuick.com/index.php?page=reference You have to click on a year in the Years section ... but note that not all year-model sections have wiring diagrams. You can also find some here (but only through '65) http://www.tocmp.com/tOCMP/wiring/5765wiring%20diagrams/buickindex.htm An issue I have is that my LeSabre's wiring harness doesn't match that of a 1964 wiring diagram - the wire colors for my harness match for that of a 1963 wiring diagram - it sounds like your's does too. I looked out at TeamBuick.com and only found wiring diagrams for a '67 and '72 (trying to get as close to '70 as I could) and the colors aren't the same as yours (those show dk.blue and white for alternator) It's not necessarily important the wire colors, as long as you know the route between a wire's ends (of course it would be nice to have a wiring diagram which matches a wiring harness's wire colors). BTW, there is a Section in the Forums called, "Sparky's corner", which is concerned with all things electrical - you should post electrical-related questions there .
Sorry for the misunderstanding. I don't have continuity between the extra set and vr I do have continuity from alt blue yellow w/clip to vr. I also checked voltage in the extra set of wires nothing with key off and 12v in both wires with key in acc. I checked out Sparky's corner do you think I should repost there.
You could send a PM to an admin for this site and have this thread "moved" to Sparky's - admins for other site forums I participate in usually move the thread to the "correct" Section without request, but I suspect threads here arent examined with scrutiny ... Or you create a new post (Sparky's) if you want fresh answers.
I was looking at my 70 assembly manual and they have a white wire and a dark blue wire coming from the alternator. They both go to the voltage regulator. The blue to the F terminal and the white to the 2 terminal. Is that yellow wire just a nasty white one? Coming out of the voltage regulator you have a red coming out of the 3 terminal heading back to the starter solinoid (and other points). And you have a brown wire coming from the 4 terminal to the fuse block. The oil pressure switch has a blue wire and it runs behind the alternator. Is the oil pressure switch in place? Not sure about the yellow one.
