Hi everyone , I want to get some jst connectors for my Bachmann Spectrum engine ( s ) , I have a couple that have bad connections. As near as I can tell they use a jst tpye connector but of course there are many different sizes to choose from, so the question is from the connector I have on my engine how or where do I measure to determine which size it is ? I know Amazon has some 1.25mm and 2.0 mm jst connectors but I’m not sure which if either would be correct. Thanks appreciate any and all help.
The 1.25mm and the 2.0mm should be the center-to-center spacing (pitch) between the contacts. Then it’s a question whether it’s a 1- or 2-by connector - 1 x 3 or 2 x 4.
You have to be very careful measuring the pitch between pins. JST makes 1mm, 1.25mm, 1.5mm and so on. On several orders I’ve missed by .25mm even using my digital micrometer.
As a result I now stock all the smaller JST connectors, they’re cheap off eBay.
You could check and see if a site like digikey has them in stock. Then you can just buy a few of each, super cheap, and shipping is generally $4-$6 if first class and under 8oz or whatever their limit is. I get all of them from them, unless happens to be out of stock, then I check elswhere. I usually order 300-400 though each time as I go through them when upgrading older BLI engines, etc. for people. But the sites like this, you can buy 1 or buy 10,000, etc. So they are not like a bulk only site.
Thanks guys this is very helpful information , would this pic I posted be a 1mm pin to pin ?
