JHowell37

The Bosch AL7558X is a rebuilt Motorcraft 6G series small case alternator. The standard rating on these was 95amps. While they can be modified to produce 200 amps, doing so on a small case alternator is probably not a good idea if reliability on longevity are priorities of yours. Additionally, they're like many high amp alternator upgrades where their performance at idle isn't much different than a stock 95 amp 6G.

Koenig-Specials 928

It is good to have options like these. Great write up and thanks. Do you have a reference for the belt? Is there a part #? Please and thanks.

risaac928

Thanks I should be getting a 84 928 here in a couple of weeks.

JHowell37

I used a 34" belt. I don't have a part# since many brands use different numbering systems. With that said, you can usually determine the length and number of ribs on most belts by looking at the number. Somewhere in the part # you'll see a 34 and then a 6. You may want to try the stock belt first as it might fit. The belt I used was only about an inch longer than the stock belt.

Koenig-Specials 928

Thanks for that info. It will help if ever I need to make this swap.

CraigL

Question: The Ford 3G, Ford 4G and Bosch AL7558X alternators appear to not be able to accept the housing for the cooling hose. Since an external temp sensor related to HVAC function is buried in the front end of the hose, what is everyone doing to address that?

Ducman82

this kind of alt does not need ducting... so my guess would be nothing. or aim the duct that would go to the alt, forward so it scoops air and gets flow past the sensor...

BC

Perfect

JHowell37

Just an update. Put about 175 miles on it today. So I've got a total of about 400 miles on the motorcraft alternator. No issues whatsoever. Haven't put the pressure washer on it yet. But when the cold front started moving through tonight, I did take it for a drive while it was raining heavily. Wipers, headlights, radio, rear defogger, and front defogger running, and it still indicated 13 volts at the dash.

Driving through puddles and swamping the Bosch with water would usually cause the voltage to drop off significantly. Swamping the motorcraft seemed to help clean it up.

I have no intention of ever putting the Bosch back on the car.

Landseer

Are you recommending some sort of voltage regulation mods?

You mentioned some sort of eco system earlier.

Speedtoys

Has nothing to do if the bosch alternator is there or not. Nobody said remove it.

billyxking

Looks like I'll have to change my alternator on my '86 32V this weekend or next. $170 new sounds good. This set up looks extremely interesting to me slash fun to try. Although I have a question regarding the non-LRC regulator. When I order the alternator do I ask for a specific non-LRC contour alternator option? Or is it the regulator off a different model alternator entirely? A model #? Cost? Ease of acquisition?

h2pmr

how does it compare in actual weight to an original alternator?

blazing928

My only concern with this style of alternator is probably my specific situation.

I 'had' a 200w alt fitted, like the one mentioned above as I run some pretty big audio amps.
I was told that i would no longer need cooling ducts as these fans pull air from the front to keep cool.
The problem is in my case is that at idle, hot day, sitting in traffic, stereo pumping, tha alt puts out a lot of current AND heat.
In the end it just fries itself and here in OZ i was unable to get it rebuilt.

The vendor is not cheap, mounts are good, but for high outputs its a poor solution.

For normal use it could be an easy cheap fix, but just be aware of the heat output at idle and the cooling required to keep the alternator from burning up.

It cost me Alt +tow truck + another new alt + masssive hassle.

depami

Turn it down, that will help. I don't want to hear/feel your music while I'm stuck in traffic with you.