Battery switch relay

Dedicated to the memory and knowledge shared by Jim Mettler - All things relating to the flow of electrons in a Pinz.
Post Reply
Posts: 30
Joined: Sat Mar 10, 2012 10:39 pm

Battery switch relay

Post by bbonomo » Sat Aug 08, 2020 12:50 pm

Hi, I found an after market relay in my battery box. I think I tracked the trigger for it down to the blue wire on the regulator plug.

The schematic actually refers to this relay (#45 - Relay to Battery Main Switch), but mine is clearly after market.

Does anyone else have a relay in their battery box?

Where is this usually installed from the factory?

Sent from my iPhone using Tapatalk

User avatar
United States of America
Posts: 1192
Joined: Sun Sep 25, 2011 12:19 pm
Location: Woodside, CA

Re: Battery switch relay

Post by rmel » Sat Aug 08, 2020 3:20 pm

The Battery ground shunting relay is normally #53 with the manual switch #54.
It would be driven by the Alternator output D+ (Blue), turning the relay on
when the engine is running (Alternator is outputting).

This relay is typically located under the dog house on the drivers side. I've
never seen it located in the Battery box. As long as the connection to the
manual battery switch (or Batt NEG terminal) and chassis ground are proper
gauge wire this should be fine.
Puller: 71' 710K 2.7L EFI aka Mozo
Follower: Sankey MK 3, 3/4 Tonne
Rescue Pinz: 73' 712M

Driver: Ron // KO0Q

Post Reply