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#3859801 - 01/28/18 11:50 AM Blowing alternator fuse?
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
I'm back to my tried and trusted mechanics. New alternator, wiring and battery. Woke the crown vic up from winter. It's ran for quite awhile got warm . Shut it off went to move it this morning amp light in on and blew the 30 amp fuse. Any help is greatly appreciated. Thanks

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#3860753 - 01/29/18 06:15 AM Re: Blowing alternator fuse? [Re: mcnkc61]
a_d_a_m Offline

3 Orange Whips
Metroplectic

Registered: 10/25/05
Posts: 27407
Loc: Cleveland, OH
I mean, I assume you put a new 30A fuse in and gave it another shot...right?

If not, do that first.

Alternator is easy enough to remove and have tested, that would be my step two.
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#3860793 - 01/29/18 07:34 AM Re: Blowing alternator fuse? [Re: mcnkc61]
Jeff2 Offline
Poobah

Registered: 08/11/08
Posts: 5058
Loc: Cincinnati, Ohio
And if it is the alternator, and you have the original 65 amp 2G, I'd strongly suggest looking at the 3G upgrade. Best thing I did to my Box when I had it. I put a 130 amp 3G in it and that stopped my headlight dimming when I had on the rear defroster.
_________________________
1991 Crown Victoria LX (sold) - Had something like 160k miles on the original 302W and AOD trans. The odometer gears broke at a bit over 100k miles, so miles were calculated by gallons of gas times prior average MPG.

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#3861065 - 01/29/18 01:37 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
This was second time replacing fuse. Wrapped up some bare wires connected to voltage regulator. Had alternator tested previously as well. It's new but I took back get to test. I guess I should replace regulator since it's easy and cheap. Upgrading just isn't in the budget right now for this one. I have a mark vi that I'm sinking money into first the crown vic is for my son he turns 16 this year and then he's going to learn how to keep it on the road. Thanks

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#3861913 - 01/30/18 09:04 AM Re: Blowing alternator fuse? [Re: mcnkc61]
Jeff2 Offline
Poobah

Registered: 08/11/08
Posts: 5058
Loc: Cincinnati, Ohio
I can understand. If you can fix yours with just a new regulator, that would be the cheapest way to go.

I did my upgrade because I got tired of replacing the 65 amp 2G. I got the 3G, alternator plug(s) and wires, and the thick gauge alt to battery wire at the junkyard pretty cheap. I had to buy a "mega-fuse" holder, "mega-fuse" (150 amp), and heavy gauge copper solder connections new because the junkyard wanted too much for a used dual "mega-fuse" box I found on a truck.

In the end, the 3G upgrade was still cheaper than buying yet another rebuilt 2G alternator from the parts store. That's why I suggested you consider it.


Edited by Jeff2 (01/30/18 10:00 AM)
_________________________
1991 Crown Victoria LX (sold) - Had something like 160k miles on the original 302W and AOD trans. The odometer gears broke at a bit over 100k miles, so miles were calculated by gallons of gas times prior average MPG.

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#3894770 - 03/03/18 01:53 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Finally got nice enough to work outside got new regulator on doesn't blow fuse warmed up good ran pretty smooth one question with all the stuff I replaced I replaced alt to solenoid wire to larger size wire. When I take volts reading at battery while running it is up in the 17.4 range crazy never seen that before. Could the wire be to large of gauge? Will this cause problem? I got the 60 amp regulator and alt . Thanks for any responses

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#3897666 - 03/06/18 08:19 PM Re: Blowing alternator fuse? [Re: mcnkc61]
gstak07 Offline
Rookie

Registered: 09/26/10
Posts: 55
Loc: Pennsylvania
You have a bad voltage regulator. Just swap to a 3G I have several laying around and they all work and most have reman tags.
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#3897674 - 03/06/18 08:30 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Took bad regulator back cheap crap. So funny thing it was running real good on 17 volts. Now with good regulator at 14.3 it's running like crap. I'm going to start with a new map sensor as I unplugged it and nothing changes. Man i hope I can get this thing running consistently again. Every time I try to move it to get to my lincoln it's gets jealous and expects to be taken out to dinner and a movie and a new dress. She is one expense lover. Thanks for any responses

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#3897986 - 03/07/18 10:28 AM Re: Blowing alternator fuse? [Re: mcnkc61]
GrandMarq9807 Offline
Over the Hill

Registered: 05/10/10
Posts: 4420
Loc: Virginia
Ya kno, it'd help if we knew what year you were working on... Asumin it must be pre '86 with a 1G alt?? Those are generally OK, not plagued with problems of the 2G...

IF the wire from alt to solenoid was a fuse link it should be replaced with same...

For poor running test, remove wire at solenoid from alt and secure so it doesn't possibly short out... Start engine... If it runs OK you have a defective alternator... If alt has a leaky rectifier it's possible to upset the ECM...
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#3898426 - 03/07/18 05:52 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Sorry I didn't say it is a 85 crown vic cfi with smog and cats removed some vacuum lines rerouted. Just been replacing parts when I have time and money hasn't seen the road since last summer. Thanks for any responses


Attachments
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#3899618 - 03/08/18 06:25 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Sounds like I need another alternator this was second one I bought last year. I didn't even 10 miles and it's clearly bad ran like crap with new map sensor until it blew the fuse again then it smoothed right out and was running good just on battery. So Ultima alt is bs. 70$ wasted and it was replaced 10/17. Guess I'm spending money again

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#3900506 - 03/09/18 07:59 PM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Got it!!! Freaking burned wires going from solenoid to harness. Took the alt back got another under warranty wasn't cause of problem but what the heck. Running good now. I'm ready to take it for a cruise and get working on the next pop up problem. I really need to invest in a fox and hound wire tool with these old Ford's. I'm learning wiring wiring wiring. Thanks for any responses I really appreciated it.

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#3900746 - 03/10/18 12:08 AM Re: Blowing alternator fuse? [Re: mcnkc61]
mcnkc61 Offline
Rookie

Registered: 11/25/15
Posts: 59
Loc: Kansas
Not proud of how I found it but this might help someone so. I bridged the fuse holder and looked for smoke sure nuff . Old guy showed me some like this years ago why chase wire just start the fire and you'll find the break. Haha fun with old cars i really love the challenge and learning seems to keep me young

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