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Upgrades and Aftermarket - 99 & up 7.3L Engine Upgrading or adding OEM or aftermarket equipment to your 1999-Up Super Duty or Excursion with 7.3L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 06-07-2010, 12:51 AM   #1 (permalink)
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Ambulance Alternator

Has anyone done this swap? I am going to attempt to swap out my stock alternator for the high amp ambulance alternator that is quite a bit larger.
it appears so far that i will need to modify the bracket for more space but it seems it will bolt up.
any help or experiences would be greatly appriciated!
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Old 06-07-2010, 08:46 AM   #2 (permalink)
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Y2K ambulances had dual altenators rated 110 amps each. SuperDuty pickups without the dual altenator option had a single 95-amp battery. So yeah, one of the altenators from a Y2K ambulance will be slightly bigger than than the stock altenator on your Y2K pickup.

But another option is to get the 130-amp single altenator from a 2002 7.3L diesel pickup. All sorts of options out there if you are willing to modify the mount to make it fit in your Y2K pickup, including the 140-amp single altenator from a 2004 6.0L diesel pickup.
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Old 06-07-2010, 09:42 AM   #3 (permalink)
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Or you could do this.

FORD DIESEL EXCURSION 160 AMP HIGH OUTPUT ALTERNATOR 02 03 8316: HO-8316-3-160 AMP ALT- DB Electrical Starter-Alternator

There are others this was just the easiest to find.
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Old 06-07-2010, 01:16 PM   #4 (permalink)
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I purchased a 215 amp alternator from autozone last night for a 2000 e-350 with the ambulance package. It is HUGE!
I believe it will fit the mount holes, but the bracket will definatly need modification. I will attempt to post pics soon after I get it mounted and
hopefully it works...
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Old 06-08-2010, 07:23 AM   #5 (permalink)
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well it is mounted, hooked up and works great. I needed to cut and modify the mounting bracket and space it up so it would not hit the upper radiator hose. here are some pics
size comparison

mounted


note the spacers used.
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Old 06-08-2010, 04:02 PM   #6 (permalink)
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You could have replaced the upper radiator hose with one meant for dual alternator application. Would have routed it out of your way. No spacers needed. Plus if your belt were to break you wouldn't have to R&R the upper radiator hose to replace it. Just a thought.
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Old 06-08-2010, 04:43 PM   #7 (permalink)
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Did you have to get a different belt because of the larger size of the alternator?

And Diablo is right. When I changed out the water pump, I went ahead and put on the upper radiator hose for dual alternators to reroute the hose out of the middle of the belt. Well worth doing, imo.

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Old 06-09-2010, 03:04 PM   #8 (permalink)
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what was the cost and the warranty on it?

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Old 06-09-2010, 03:17 PM   #9 (permalink)
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Nice! I might have to do that one of these days... Getting ready for another one to die I think!
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Old 06-09-2010, 05:10 PM   #10 (permalink)
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So what was the reason for going to such a big alternator?? I can see up grading to a bigger one like the DB...But wow that beast is huge!!! When my aftermarket fog lights are on and ac cranking the idle drops a fraction and the headlights dim ever so little. But I feel ok with my alternator. I keep looking at the pic it looks nice.
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Old 06-09-2010, 08:14 PM   #11 (permalink)
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Ford believes it is necessary to disable one alternator of a dual system when the glow plugs are on. They think glow plug life will be shortened with full charging voltage to them.
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Old 06-09-2010, 08:22 PM   #12 (permalink)
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Quote:
Originally Posted by SmokeyWren View Post
Y2K ambulances had dual altenators rated 110 amps each. SuperDuty pickups without the dual altenator option had a single 95-amp battery. So yeah, one of the altenators from a Y2K ambulance will be slightly bigger than than the stock altenator on your Y2K pickup.
My truck has factory dual 110 amp alternators. They are small case 6g alternators. I'm not aware of a smaller cased alternator. I have the new parts to build a couple of large case 6g 135 amp units for my truck. I may have that project finished in a couple of weeks.

The alternator in that picture is not the OE Y2k unit.
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Old 06-10-2010, 09:32 AM   #13 (permalink)
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Yeah, the word "bigger" was not technically accurate. "Higher capacity" would be more accurate.
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Old 06-13-2010, 01:44 AM   #14 (permalink)
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Quote:
Originally Posted by 444-4D View Post
Ford believes it is necessary to disable one alternator of a dual system when the glow plugs are on. They think glow plug life will be shortened with full charging voltage to them.
Why is it charging when the glow plugs are on (ie, when the engine is off)? What am I missing?
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Old 06-13-2010, 09:11 AM   #15 (permalink)
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Quote:
Originally Posted by Maverick4x4 View Post
Why is it charging when the glow plugs are on (ie, when the engine is off)? What am I missing?
In cold weather, the glow plugs stay on for a minute or so after the engine starts. The wait to start light goes out, but the glow plugs are still pulling juice after the altenator(s) begin cranking out the juice. This helps warm up the combustion chamber so you get complete combustion faster (therefore less smog emissions).

Here are the words from the diag manual for a 2002 7.3L engine with CA emissions. Engines with 49-state emissions use similar logic:

Quote:
Originally Posted by PC/ED Manual
The glow plug on-time is controlled by the Powertrain Control Module (PCM) and is a function of oil temperature, barometric pressure and battery voltage. The PCM enables the Glow Plug Control Module (GPCM) which drives the individual glow plugs. Glow plug on-time normal varies between 1 to 120 seconds. In addition to the PCM control, the GPCM internal limits the glow plug operation to 180 seconds regardless of PCM commanded on-time. The power to the glow plugs is provided through the GPCM solid state drivers directly from the vehicle battery. ...
Note: Wait to start lamp on time is independent from GPCM on time.
So assuming your batteries are in good shape and the key is turned on, the colder the oil, the longer the glow plugs are on - regardless of whether the engine is running. Notice the computer logic of "is a function of oil temperature, barometric pressure and battery voltage" doesn't include any input as to whether the engine is running.

I don't know what barometric presssure (altitude) has to do with glow plug operation, but apparently the Ford computers (modules) use it too. Maybe the higher up in the mountains you are located, the longer the glow plugs stay lit? Or vice versa?
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