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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-24-2013, 03:24 PM   #21
jfoj
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Quote:
Originally Posted by jbatman View Post
Will definitely check that first. I have to remove the plastic shield to see that don't I?
That`s exactly why I told you to use the jumper cable test. I did not want to go into details as to what the purpose of putting the jumper cable between the engine and body was about until the test showed some sort of improvement.

Not sure you understood what/why I told you to perform the test??

Also you need to check very carefully that your serpentine belt is routed correctly and the tensioner is working properly. Not sure you can misroute the belt easily, but usually on an alternator you need about 1/2 a pulley wrap of the serpentine so you will not get any belt slippage. Believe me it happens. Maybe a picture of your belt around the alternator will give some clue if this could be an issue??
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Old 07-24-2013, 03:45 PM   #22
jbatman
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Join Date: Apr 2013
Location: Dallas
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Originally Posted by jfoj View Post
That`s exactly why I told you to use the jumper cable test. I did not want to go into details as to what the purpose of putting the jumper cable between the engine and body was about until the test showed some sort of improvement.

Not sure you understood what/why I told you to perform the test??

Also you need to check very carefully that your serpentine belt is routed correctly and the tensioner is working properly. Not sure you can misroute the belt easily, but usually on an alternator you need about 1/2 a pulley wrap of the serpentine so you will not get any belt slippage. Believe me it happens. Maybe a picture of your belt around the alternator will give some clue if this could be an issue??
I couldn't get a clear shot of the belt/alt..I'll have to wait until after work to get home and get the air filter box off to take a better pic. The trouble with the grounding test you suggested is that the voltage drop is random and I've never encountered it off a cold start. I see it sometimes when I'm coming back from lunch which would be the only time I would be in the position to do any sort of testing while the problem is happening and with the car immobile (without pulling over on the highway). Running that test over lunch in the parking lot in 100+ heat in business casual attire sounds miserable. I'll have a better shot at it over the wkend when I have more time.

Last edited by jbatman; 07-24-2013 at 03:50 PM.
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Old 07-24-2013, 04:30 PM   #23
beasted86
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Originally Posted by Stinger9 View Post
Do you know the theory here? Hand held cannot load test obviously. Curious how it could give accurate results.
Yes, the handheld Midtronics unit is a load tester.

Like I said it is a reliable tester, and is the standard in all dealerships. All warranty claims require a Midtronics test with the failure code.
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