Question about 1972 Aermacchi Sprint 350

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How do i test the the altenator on a (aermacchi) z90

How do i test the the altenator on a (aermacchi) harley 1973 z90. system now not charging

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If you know its location trace wire harness up to the first disconnect and read into the plug, there should only be three pins, measure the resistance of any two pins in any combination and they should all read less than 1 ohm, if any one of the three winding read open, or high resistance, then its bad, and will need to be replaced. usually its not the alternator that causes the charging problem, its the regulator. Your battery has to be in good condition to start with... so it can accept a might have a bad cell in it..battery voltage static, should be minimum 12.4 volts..12.6-to 12.7v nominal. if your battery reads 11 to 12.0v and is over two years old, its probably bad. Can i get a ratting if this helped you, thanks!

Posted on May 02, 2010


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How do i conect the alternater to the battery on a 1973 aermacchi Z90 motor cycle

Technically you can't. A battery is direct current DC and an alternator is alternating current AC. You need to connect a rectifier to the alternator output wires this converts AC to DC then you will need some form of regulator to make sure the current does not overload the electrical system. Most modern bikes have the rectifier and regulator in one unit. Older bikes often had/have 2 units to cover this.

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Hi Bobrodhome, you need to have your charging system checked out and your battery load tested I am sorry you can't find the first and best tool you ever bought for your Aermacchi but despair not for a mere $0 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day. Sprint 175 250 350

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I have a copy of a service manual for my 1973 Aermacchi Sprint SX. The manual has no reference to torque wrench settings? Do you know where I can get this info?? Thanks in advance.

Hi Geoffa58, most of the fasteners on a Harley Davidson are made of medium carbon heat treated steel SAE grade 5 or better.
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May 04, 2011 | 1972 Aermacchi Sprint 350

2 Answers


ss 350 aermacchi?There are many on-line salvage parts dealers that will have what you need. this is just one example. ,

Nov 10, 2008 | 1971 Aermacchi Sprint 350

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