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rw7810

03-19-2020 07:58 PM

Difference between red & black relay

Ok, gents, I think I used to know this, but what is the difference between the red and black round relays used on early models ?

timmy2

03-19-2020 09:31 PM

Red ones have a back feed diode to stop it from re-striking on a collapsing field, black ones do not.

Arne2

03-20-2020 07:24 AM

So red could generally be used to replace black, but not vice-versa?

timmy2

03-20-2020 02:30 PM

To Arne, yes.
It’s really only the collapsing field of the fuel pump motor that is a concern. Wouldn’t want it to fire back up when turning the engine off... :)

rw7810

03-20-2020 03:29 PM

Thanks

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