Question about Dodge Pickup
1999 dodge ram, blower motor runs when hotwired. Fuses and relays seem OK. Removed fan switch from dash and checked wiring with test light, no current with key on. Where else or what else can I check
Do further tests at the relay to ascertain whether the fault lies before or after the relay.
Check power availability at the supply side of the relay contacts - should have 12v from a supply fuse on one side of the normally open contact (note -this supply may only be available when Ign or Acc sw is on).
If power supply is ok at the relay contact, check control input to relay operate coil.
If a ground (or 12v) operates the relay, operate the relay with a local ground (or 12v) and check blower motor runs.
If all above OK, check control signal from fan switch is arriving at the relay control coil.- if not trace wiring back to the switch.
Posted on Jul 03, 2009
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Posted on Jan 02, 2017
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