Could anyone help me with the operation of the intake heaters in a NH L785 with intake heaters. What I want to know is how these are supposed to operate. I understand that they run off a solenoid but currently power only goes to them under starting operation (while the starter is being turned over). This makes no sense to me. I would assume that they should operate the same as a glow plug in a pickup. IE. turn the key on and wait for 10 or so seconds until they heat up, then turn the engine over. I would also assume that they should run for a while until the engine warms up. Could someone please educate me on how these should operate? and if they are operating incorrectly - what my problem might be? Thanks in advance.