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I have a 1996 4.6L mercury cougar, The alternator is not ...


Sent to Car Experts May 18, 2006 5:47 p.m.

I have a 1996 4.6L mercury cougar, The alternator is not showing acharge on the vehicle, but when i take it off to have it tested, it works great. When I test it on the vehicle, it shows nothing( it was an intermittent problem until now). I have replaced the battery, alt connectors and the voltage regulator. Where do I look now?? Thanks

Edited by Customer (name blocked for privacy) on May 18 2006 at 6:02pm


Optional Information:
1996 Mercury cougar xr7 4.6l

Already Tried:
battery, voltage regulator, alt.connector and cleaned batt term.
Customer (name blocked for privacy)
Status: Closed   Value: $15   
Info Request
May 18, 2006 6:17 p.m. (30 minutes and 9 seconds later)
REPLIED to Info Request Check Mark

Do you have power at the big heavy wire when the key is off?



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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
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Reply to Hammer Time
Sent May 18, 2006 6:27 p.m. (10 minutes and 1 second later)

No sir, I do not. I do have power at the 3 wire connector when the key is on (1st & 3rd) and also w/ vehicle running - also the small seperate wire w/ veh on.
Customer (name blocked for privacy)
Answer
May 18, 2006 6:48 p.m. (20 minutes and 40 seconds later)
REPLIED Check Mark

If you don't have power at the main feed wire, then you have a burnt out fusable link. You can verify this by using a jumper wire to jump from that wire to the positive side of the battery with the engine running and see if it starts charging. If it does, that confirms the burnt link. You should find them coming off the starter solenoid/relay near the battery. Pull on each one and if anny stretch, the are burnt. be sure to only use link material to replace it.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
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Reply to Hammer Time
Sent May 18, 2006 7:26 p.m. (37 minutes and 34 seconds later)

I tried that, all I had was an 8guage wire, but when I touched it, the voltage jumped up, so that should be it? ofcourse it sparked and I couldnt hold it very long. Two questions 1- the red wire comes off the alt and goes into a harness- it seems to split 1goes to the master fuse(on the side of the fuse box) and then from there to the battery, the 2nd one goes down to the bottom of the car(maybe to the starter? I dont see a fuseable link by the battery. isnt the solenoid on the starter? is that where the link could be? the 2nd question is, what could have caused this? If i replace this link(is this a dealer item & does it come as 1 piece- red cable incl?) will it just break again? thanks

Edited by Customer (name blocked for privacy) on May 18 2006 at 7:26pm
Customer (name blocked for privacy)
Answer
May 18, 2006 7:38 p.m. (12 minutes and 20 seconds later)
REPLIED Check Mark

You can buy fusable link at most any auto parts store.

Looking at the schematic, it appears it's just that big mega fiuse. It's hard to say why it happens. The most common cause it crossing the battery cables or jumpers but it may have exceed the charging limit.

here's the schematic. I don't think either one of them goes to the starter. It shows them joined together and going to the battery.

Images available only to Customers.



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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent May 18, 2006 8:56 p.m. (1 hour and 18 minutes later)

OK i found this link, i do have power on one side and not on the other. I went to go get it, couldnt find one, so i will go to ford tomorrow. Thanks for the help & I will accept this answer so u can get paid. Im just wondering one thing.. When this problem was intermittent- it would be charging, then not until it was off &cool several times it did this..will that master fuse do that?? Im just wondering if I have another problem too, If you know please tell me, i dont know if you will be able to answer after i accept, so i will try.
Customer (name blocked for privacy)
Answer
May 18, 2006 8:59 p.m. (2 minutes and 36 seconds later)
ACCEPTED Check Mark

I would suspect that the link was still making some contact but couldn't carry the whole load.

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply
Sent June 16, 2006 6:38 p.m. (28 days and 21 hours later)

Relist: I still need help.
I replaced the fuseable link, but still am having the intermittent problem of -the car will quit charging(goes down to the red-8 in the dash) and then it will start charging again, sometimes in a minute & sometimes hours. note- I have also replaced the alternator with 100% new one & still the same problem.
Customer (name blocked for privacy)
Answer
June 16, 2006 6:42 p.m. (4 minutes and 51 seconds later)
REPLIED Check Mark

Use the same method of testing it when it is not charging. Use a jumper wire from the main post on the alternator over to the positive post of the battery. If that makes it charge, then you still have problems with the fusable link. If that doesn't push it into charging, then you likely have a bad alternator.

By the way, I haven't seen a "new" alternator in 35 years. They are all remanufactured. Some much more reliably that others.



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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent June 16, 2006 7:06 p.m. (23 minutes and 14 seconds later)

ok i will try this, problem is sometimes i can drive 30 to 40 miles before it will act up and even then it will start charging in a minute or so. Also right before i changed the alt.,it would start charging when i turned the ac off & stop when i turned it on, but it was doing fine & i came to a stop & it quit charging & then started charging again. someone also said it could be the cable between the alt & master fuse or the neg cable?
Customer (name blocked for privacy)
Answer
June 16, 2006 7:10 p.m. (4 minutes and 48 seconds later)
REPLIED Check Mark

You may be misreading your gauges here.

It's normal for the battery voltage to drop when you turn on a lot of accessories and let the RPMs drop. The engine speed just isn't turning the alternator fast enough to keep up with that much current usage. If your sitting at idle and flip the A/C on, it's normal for a voltmeter to drop some. Do you have a battery or charge light coming on?



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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
Reply to Hammer Time
Sent June 16, 2006 7:33 p.m. (22 minutes and 17 seconds later)

on the guage there is an 8 w/ red on the far left & far right is an 18 & in the middle "norm". When it goes down, the guage pegs the 8 as far as it can go into the red. I havent noticed the battery or charge light on.
Customer (name blocked for privacy)
Answer
June 16, 2006 7:50 p.m. (16 minutes and 49 seconds later)

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PictureHammer Time  -- L1 Master Technician -- 98% Positive Feedback on 2710 Car Accepts
ASE Mastertech with Adv level Engine performance cert.

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