Ford Escort


Old 10-01-13, 07:40 PM
Thread Starter
Join Date: Oct 2013
Location: USA
Posts: 1
Unhappy Ford Escort

Have a battery drain and no one seems to know if I apply my volt meter across the starter relay B and M Posts should I be getting voltage. Replaced battery, alternator (which tested bad at auto parts store) and starter relay. 1987 Ford escort, l4 1.9 L gasoline engine. Had starter checked at auto parts store also. Did find one bare wire to accessories and repaired it.
Sponsored Links
Old 10-01-13, 10:20 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: NJ - USA
Posts: 43,461
Welcome to the forums.

Yes....if you put a voltmeter on the B and M terminals you will get a voltage reading.
The B stands for battery and the M stands for motor or starting solenoid. You should see full battery voltage with red probe on B and black probe on M. Since the relay is like a switch....when it's open the circuit voltage will appear across the contacts.

It's pretty rare for the starter relay to be the cause of a voltage drain.

The easiest way to check for a voltage drain on a battery is pull off the negative battery lead and connect a test light inline with it. With the car doors closed, you connect the light, it should be bright and then dim down. If the light stays bright for more than a minute you start pulling fuses out of the fusebox one at a time until the light dims or goes out.

The problem will be on an "always live" fuse so if you have the fuse box diagram(s) you can save some time by not pulling fuses that are only live with the key on.

A bare wire will not cause a battery drain. If a wire touches ground it will create a short and blow the fuse.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes