Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Electrical Specifications

Manifold pressure Voltage specifications*

5 in Hg (125 mm Hg) 2.5 Volts
10 in Hg (250 mm Hg) 2.0 Volts
15 in Hg (375 mm Hg) 1.5 Volts
20 in Hg (500 mm Hg) 1.0 Volts
25 in Hg (625 mm Hg) 0.5 Volts

*Measured at Engine Control Module (ECM) terminals D17 (+) and D21 (-).