Magnusson-Moss Act
Also see this post about warranty problems...
Warrantee Denied/What To Do - Harley Davidson Community
If a dealer refuses a warranty claim because he claims that you have made modifications to your bike and that system is not where the problem lies, you should print this out and take him or her a copy. Only those systems that are directly affected by your modifications are affected.
This is a 1975 United States Federal Law which deals with consumer warranty coverage. It defines responsibilities for both the buyer and the seller of all consumer goods costing more than $25. A portion of this law applies to after market parts and modifications and how it affects your vehicle warranty.
For our purposes the law basically states that you have a right to use after market, non-OEM parts on your vehicle and still retain the factory warranty. However, if there is a failure and the manufacturer can show that the failure was caused by the aftermarket part, they can deny coverage.
The important thing is that your dealer cannot VOID your entire warranty just because the part is on the vehicle. There have been cases where a dealer would tell a customer that their new vehicle had no warranty because it had an after market exhaust or other part. Granted, the exhaust or other part is not covered, however the rest of the vehicle is still under the normal warranty.
Under Magnusson-Moss Act a dealer must prove, not just vocalize, that after market equipment caused the need for repairs before they can deny warranty coverage. If they cannot prove such claim-or offer an explanation- it is your legal right to demand compliance with the warranty. The Federal Trade Commission (202.326.3128) administers the Magnusson-Moss Act and monitors compliance with warranty law.
In large cities, there are always other dealers you can do business with. It's a good idea to find out about the most cooperative performance-oriented dealer available to you by checking with clubs, local groups, etc.
If you live in smaller communities, make sure that an uncooperative dealer knows that they are giving you plenty of reason to take you business elsewhere.
If you should have to do that, write the "manufacturer" to tell them that their dealer's activities have caused you to buy from another car company!
The bottom line is to talk to your dealer and get their feeling about after market mods. Some dealers are more prone to be ok with it than others. Your option is to find a dealer that will work with you and not against you for their profit.
If all else fails, tell them to put it in writing about the warranty being void and that you want it to be specific as to the reason. Chances are they will rethink the situation because you have them in the corner for the most part. A warranty can not be voided completely because of only one part. Only that part and any resulting damage from that part if any can be said to not be covered.
If a bike is "DOWN" or "out of service" because of a defective part, special ordering and delivery of parts being needed can be expedited by the dealer from the MOCO to get the bike back in service if they so choose. It's just that a lot of them are lazy and will just let the customer wait until they order the part and it's delivered normally.
Here's a few links that will explain it in further detail
A Businessperson's Guide to Federal Warranty Law
Magna Charger manufacturers intercooled supercharging systems for late model GM and Ford cars, trucks and SUVs utilizing OEM quality Eaton hybrid superchargers.
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