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Old 02-13-2018, 02:37 PM   #1
Old_goldvolvo240
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Default Alternator not alternating

Check wires, checked ground, checked connections, replaced alt, battery is good, but alt still wont maintain charge of battery any thoughts i havent checked?
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Old 02-13-2018, 02:42 PM   #2
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Bad aftermarket stereo install. Loose alternator belt?
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Old 02-13-2018, 03:04 PM   #3
Old_goldvolvo240
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Havent changed radio belts tight
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Old 02-13-2018, 03:07 PM   #4
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Has the battery been charged and checked? If the battery is good and the alternator isn't charging. You next want to check that the charge light circuit is providing 12v to the alternator D+ terminal. Make sure you have it on the proper spot.
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Old 02-13-2018, 03:24 PM   #5
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Quote:
Originally Posted by dl242gt View Post
Has the battery been charged and checked? If the battery is good and the alternator isn't charging. You next want to check that the charge light circuit is providing 12v to the alternator D+ terminal. Make sure you have it on the proper spot.
Also make sure you check voltage at the alternator and make sure the ground it attached from the alternator to the block. Is this the original alternator? Brushes/voltage regulator could be gone on it.
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Old 02-13-2018, 03:35 PM   #6
ZVOLV
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Test lamp to exciter wire. Excited?
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Old 02-13-2018, 06:41 PM   #7
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Quote:
Originally Posted by Old_goldvolvo240 View Post
alt still wont maintain charge of battery any thoughts i havent checked?
Interesting...
So what's the problem exactly? The charging light on the dash stays on, the output voltage is too low or the car doesn't start?
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Old 02-13-2018, 07:11 PM   #8
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After finally getting my 240's charging to work properly, first question: Does the battery warning come on with the key on, engine off?
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Old 02-13-2018, 07:57 PM   #9
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Quote:
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After finally getting my 240's charging to work properly, first question: Does the battery warning come on with the key on, engine off?
Yes, and also you will briefly see it when you turn the car off.
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Old 02-13-2018, 10:41 PM   #10
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Tested it, its a bad alt thank you everyone who replied.
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Old 02-14-2018, 12:56 PM   #11
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I've usually been able to breathe new life into a Bosch alternator for my brick by replacing the voltage regulator in the rear.

Simple to do; the problem typically turned out to be worn brushes, which the replacement voltage regulator replaces with new ones.
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Old 02-14-2018, 01:44 PM   #12
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Yep. Much better than putting some aftermarket reman junk in your car that has probably failed once before in it's lifetime. Easier too. Good point!
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Old 02-14-2018, 08:56 PM   #13
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I've usually been able to breathe new life into a Bosch alternator for my brick by replacing the voltage regulator in the rear.

Simple to do; the problem typically turned out to be worn brushes, which the replacement voltage regulator replaces with new ones.
This.

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Yep. Much better than putting some aftermarket reman junk in your car that has probably failed once before in it's lifetime. Easier too. Good point!
And this too...

If you must replace the alternator, get a good used OE Bosch unit or a reman'd Bosch. Avoid the AutoZone or equivalent aftermarket garbage.
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Old Yesterday, 03:23 PM   #14
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Or pick up a nice 100A Nippon denso alt
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Old Yesterday, 07:49 PM   #15
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Or pick up a nice 100A Nippon denso alt
i'll second this one. and while you're at it grab some of yoshi's aluminum bushings. it's like bolting Buddha to Jesus then watching them generate much needed amps.
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Old Today, 09:00 AM   #16
Old_goldvolvo240
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New issue, d+ has power when key on engine off but when key on engine on theres no power any ideas or anyone have access to wiring diagram
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Old Today, 09:24 AM   #17
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I wouldn't recommend any Nippon denso alternator. They fail a lot faster than a Bosch unit. Stick with Bosch.
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Old Today, 11:15 AM   #18
ZVOLV
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Quote:
Originally Posted by Old_goldvolvo240 View Post
New issue, d+ has power when key on engine off but when key on engine on theres no power any ideas or anyone have access to wiring diagram
It's normal to read, like, a volt on it when running if it's connected. Disconnect it and it would be another story. Whats the issue? No charge? Is your ground wire OK? Belt tight? Slap 12v to the exciter terminal manually once per engine start to determine if it's an exciter circuit issue or not.

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