More Installation Tips

Blocking-diodes are loved and hated. Whilst battery charging is automatic, with provision for battery dedication e.g. for start and house batteries, there can be up to 1v drop across the diode. This is a disaster for battery charging employing conventional voltage regulators and machine-sensed alternators. Blocking-diodes should never be used with standard alternator regulation.

The ZM4 compensates for this voltage drop, so the benefits of automatic charging are retained.

If your alternator has a blocking diode between the alternator and the battery, then you cannot expect the alternator to excite the alternator, it will need to be done from an external source independent to the blocking diode.

An alternator has a huge fan that draws air from the back to the front of the alternator for cooling; imagine if this air has salt laden air in it, this will cause corrosion in non marinised alternators. Consider getting the internals painted in good quality paint to get a longer life out of your alternator.

NEVER turn OFF the battery switch with the engine running, it can blow up the alternator and or the smart regulator.

Alternator Terminal Designations

We have listed the common alternator connection terminology for identification between different brands. 

Make

Output

Negative

Field

Auxiliary

Tachometer

Bosch

B+

D -

Df

D+

W

Ingram

B+

B -

F

IND AL

W

Lucas

BAT

E

F

L

 

Paris-Rhone

+

-

Df

61

W

Sev Marchal

B+

D -

Df

61

 

Motorola

BAT

-

F

AUX

AC

CAV

D+

D -

F

IND

 

AC Delco

Bat

GND

F

 

 

Valeo

B+

D -

 

D+

W

Mitsubishi

B+

E

F

L

 

Nippon Denso

B+

B

F

L

 

Prestolite

POS+

GND

F

IND LT

AC

Silver Bullet

+

-

F

 

R