How do i check starter voltage on 1995 7.3 Ford F250? The batteries are less than a year old. They are being drained frequently. Today truck will not crank. Starter checked out by mech.
Sounds like you have something else draining battery. Possibilities include the alternator. For starter cranking voltage place the positive lead of voltmeter on positive of battery and the negative on the other. Disable fuel, then crank for 15 seconds and read volts while cranking. This is your cranking voltage. For voltage drop on cables, place positive on battery positive and negative at battery cable on starter. Crank 15 seconds. This should be less than .5 volts. The same can be done with any cable or wire in the starting or charging circuit of a vehicle. Just place the positive on positive or negative on negative, with the other lead at the opposite end of the cable being tested. In charging diagnostics, you will get the charging system operating with the engine running while you do the readings. I suggest though, that you do a parasitic drain check. If you disconnect the positive cable of the battery and place a test light in series (one end to battery, the other to the cable), you should have a very dim light to no light. If the light is bright, you have a drain. Proceed by making sure everything is off and there are no dome or hood lights on. Start removing fuses one at a time until the light goes out or gets very dim. Replace each one after you check it to avoid having a pile of fuses to put back. Also disconnect the alternator wiring to eliminate this possibility. A fried regulator may feed voltage to the fields all night if it's shorted. This will drain both batteries in relatively short time.
Sep 20, 2009 |
1995 Ford F250