Overcrank Protection (Ocp) Circuit Check; Multi-Battery Charging With Series And Parallel Chargers - Borg Warner Delco Remy 28MT Diagnostic Procedures Manual

Thermostat Leads (2)
Motor
Thermostat
Connections

5-2. OVERCRANK PROTECTION (OCP) CIRCUIT CHECK

To check the thermostat in the OCP circuit for continuity, detach
wiring harness connector and connect an ohmmeter to the two
thermostat terminals on the starter. The ohmmeter should read
zero. If not, thermostat is open circuit and the starter should be
replaced prior to proceeding with other tests in this booklet.
DO NOT check thermostat when hot since it is supposed to be
open circuit above certain temperatures.
5-3. MULTI-BATTERY CHARGING WITH SERIES AND PARALLEL
CHARGERS
These procedures assist in providing charged batteries for
future service. However, "boost" charging or "fast" charging is
not covered. Below are basic guidelines for charging groups of
batteries and supplements information contained in the Delco
Service Bulletins, 1B-115 and 1B-116.
The two types of battery chargers in use today for charging a
group of batteries are:
• Current-limiting (often called Constant – Current or Series
Chargers)
• Voltage-limiting (often called Constant – Voltage or Parallel
Chargers)
With current-limiting, the batteries are connected so that each
battery receives the same amount of charging current. (See Fig. 1
for typical hook-up.)
delcoremy.com
DELCO REMY STARTERS WITH OVERCRANK PROTECTION
Connect to same ground point as standard circuit
(may be through relay or fuel pressure switch)
With voltage-limiting, the batteries are connected so that the
charging current is divided and each battery receives only the
charging current it can accept at the charger's voltage. (See Fig.
2 for typical hook-up.) Because of these differences, the charging
procedures also differ.
No matter which type of charger is used, differences exist among
batteries: age, capacity, size, state of charge, and type. These
differences mean that time and attention must be given to
batteries during the group-charging process.
A
V
CHARGER
A CHARGER AMMETER
FIGURE 1.
A
A CHARGER AMMETER
FIGURE 2.
DP-1029
V V
V TEST VOLTMETER
DP-1030
V
V TEST VOLTMETER
DP-1031
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