kelownadiesel

Hey guys my voltage isnt dropping at all.Its hovering around freezing or lower,the truck starts fine and I dont plug it in.i went to price out relays and the place had nothing in the computer.Any thoughts on a part number or whether that is the problem at all.I need them working when i go up north

ratsun

IIRC there is a fuse for the heaters, did you check that?

infidel

No fuse, the wire from the battery to the relays is a fusible link and could be blown. It will look visibly burnt/melted.

Use Ford starter relays if you need replacements as explained here

https://www.dieseltruckresource.com/...d.php?t=127198

kelownadiesel

thanks bill,Ill check it out

kelownadiesel

Ok Ive got 2 relays with 2 small terminals on each.Ive tried every possible wiring scenario.The only way i can get the relays to work is if I ground the case to the sheetmetal.Then I cant get them to turn off.ive tried switching the small wires every which way.I get positive off of the green wire and ground off of the orange.I cannot get the sloenoid to trigger unless it is screwed to the metal.Im fed up ,been at it for hours and will probably just hard wire the trigger through a switch and turn on the relays manually.I dont know why they wont cycle.Oh they are ultra ford starter solenoids with 2 small posts.Also is there any reason that i would need 2 solenoids if I were to trigger the heaters through a switch? Truck is a 97 auto

kelownadiesel

Oh I should mention that when I was testing the small wires the one that produced the negative was always very weak and flashed.Im thinking that whatever controls this is shot.Perhaps the intake air sensor?

berner

The Hayne's manual has an excellent section on checking every component of the grid heater circuit. Well worth the $20.

kelownadiesel

thanks man,Ive got the manual and didnt even think to look.I rigged them up anyways now.