CMS-Japanese Motorcycle Supply Parts

Main fuse blows when key turned to park - Honda CX500

Before using this site please read the site disclaimer. Also please note that any links provided may be part of an affiliate programme (viz. eBay, Amazon) which helps support the site as I will earn a commission when visitors make a qualifying purchase.

So, you just changed your ignition key switch out for a new one (or a new-to-you one) and now your main fuse blows whenever you turn your key to Park (P). What gives?


Unfortunately, this is most likely to be a symtom of a keyswitch which doesn't suit your model. One example of the cause of this is the above picture - on the left is a keyswitch from a 1980 CX500, on the right a new replacement from eBay which is supposedly for the same year of CX500. Note the difference....:


The pinout is 6 vs. 5 pins... and while the matching 6-pin connector on the wiring harness fits, you'll blow the fuse when you turn it to park. The ignition switch on the right is for later/different models of Honda.

Can't return it? Well, if you have an intact plastic section containing the electrical parts on your old keyswitch and the new one, you can combine the two to create one which works... see this post!

Search MotoFaction:

Follow us on Facebook!

Follow us on Instagram!

CMS-Japanese Motorcycle Supply Parts

Search MotoFaction:

In 2019 the server has had to double in capacity to support the growing site... please consider dropping the site a donation to help cover the costs! Check out our Patreon for support options, buy a shirt, buy our apps, use my NordVPN affiliate link to sign up to their service or donate via Paypal:

Paypal $5 link ->>
Paypal $10 link ->>