I'm installing a new relay for an accessory and I can't seem to figure out how to make a good, safe connection for the wires going from the relay to the battery positive and ground?
Any thoughts?
Best answer:
Answer by Zzonyx
You don't provide any details, the answer can likewise be only generic: mace sure the power lead form the nearest source (existing fuse or directly from the battery) has proper cross-section, or you'll have excessive voltage drop which reduces performance.
If there is no fuse, install an extra fuse with the proper ampacity (it may be an in-line, but make sure it is in an accessible location - fuses do blow sometimes).
The ground is usually through the relay metal body or a dedicated and marked relay terminal; if it's a lead, it must have the same cross-section as the plus lead.
The control circuit is operated by an existing or custom-installed control or switch, either with a common ground (3-terminal relays) or a dedicated return terminal (4-terminal ones). It usually requres lighter wire gages.
Make sure that all wires are automotive-grade ones and the terminals are safely and solidly crimped on - this is important - there is a fire hazard related with these "minor" issues.
There are also different types of relays - the most common ones are ON while the control circuit is ON and vice-versa.
Depending on the service operated, it's a good idea to have a pilot lamp (a LED) operated from the power circuit so that you can see when it's ON or OFF.
LAst but not least: if you're unsure, have someone experienced do it for you - way cheaper at the end of the day.
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