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Ron B.C 09-04-2019 04:21 PM

Alternator wiring
 
I had my alternator checked and turns out it is good. Its a 1 wire Bosch unit. AL8659. The 1 wire on the plug (red with black stripe )that runs into the harness that should go to the ignition or some ignition switched power if I am correct. I am having trouble locating where that connection is. I dont see any red/black stripe wire under the dash/fuse panel etc.

Edit: there is 12v running to the alternator on the 1 wire plug from ignition source. But no volts coming out on the b+

Jyrocharlie 09-04-2019 04:39 PM

Battery +

twinboat 09-04-2019 08:12 PM

Is there 12 volts at the ( bug ) output wire going to the alternator ?

Ron B.C 09-04-2019 08:17 PM

Quote:

Originally Posted by twinboat (Post 4941944)
Is there 12 volts at the ( bug ) output wire going to the alternator ?

There are 2 wires on the alternator. The small 1 that goes into the rectangular plug from ignition source has 12v. The larger output wire that runs to the battery shows 1 to 3 v

Jyrocharlie 09-04-2019 08:36 PM

A picture of the back of it would help, and , what it's supposed to fit. The guys that tested it likely know what that wire goes to when it checked ok.

Ron B.C 09-04-2019 09:02 PM

2 Attachment(s)
[ATTACH]Attachment 259165[/ATTACH]

The small wire is on the second pin. "I"

88 Chev 454

I had it back to the shop, they tested it a second time with me standing there.
Everything checked out on it.

twinboat 09-04-2019 09:36 PM

The battey wire should have 12 volts on it.

Follow that bigger wire and find out if it goes to the battery or to an isolator.

Your picture shows 2 different alternators, confusing. Did you replace the Delco with the Bosch ?

The shop tested it and its fine, but it doesn't work ?

If you have a isolator in the system, you may need to use the exact Delco you took off.

I see two small wires on the plugin connector. One is ignition, is the other one hot all of the time ?

Ron B.C 09-04-2019 11:40 PM

Quote:

Originally Posted by twinboat (Post 4942079)
The battey wire should have 12 volts on it.

Follow that bigger wire and find out if it goes to the battery or to an isolator.

Your picture shows 2 different alternators, confusing. Did you replace the Delco with the Bosch ?

The shop tested it and its fine, but it doesn't work ?

If you have a isolator in the system, you may need to use the exact Delco you took off.

I see two small wires on the plugin connector. One is ignition, is the other one hot all of the time ?

The 2 pictures are of the same alternator and there is only 1 wire in that plug.

twinboat 09-05-2019 06:18 AM

How did they test it, on the engine ?

Does the batt wire go to a isolator ?

cfowler55 09-05-2019 06:32 AM

Looks like it is a Delco alternator that has been rebuilt by Bosch. The large wire is battery positive. You should have 12 volts all the time on that wire. Should be a fusible link wire close to the battery. Pull on it , if it stretches the wire is burned thru inside the insulation. Also make sure it has not had an isolator added inline somewhere.
Charlie

theoldwizard 09-05-2019 06:57 AM

Quote:

Originally Posted by cfowler55 (Post 4942301)
Looks like it is a Delco alternator that has been rebuilt by Bosch. The large wire is battery positive. You should have 12 volts all the time on that wire.

Closer to 14V when the engine is running at high idle !

Ron B.C 09-07-2019 09:48 PM

2 Attachment(s)
Attachment 259547 This 1 is above the alternator. It is for the starter as I jumped it and the motor turned over. Im not sure where the small red wire with the yellow end goes. There is no voltage on it but it is on the live side of the solenoid.

Attachment 259548 This 1 is under the hood, Left side comes from the battery and then runs to the starter motor. right side has 1 large gauge and 2 smaller gauge wires. I coudnt get any voltage to the right side with key on or jumping the solenoid, so i would say its cooked and will replace. There was no voltage to the small terminal with key on either. I bypassed the solenoid and put power to all the wires on the right side then checked for voltage at the alternator and still had nothing. I didnt see any fusible link from the alternator to the battery. but there is some spots of the harness I could not see.

Ron B.C 09-09-2019 10:13 AM

Is there any reason why I shouldnt run a new cable from the alternator to the battery? Bypass any isolator I may be missing.

twinboat 09-09-2019 11:46 AM

That can be done, or as most factory installs, run the wire from the alternator to the battery post on the starter motor.


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