Re: Block Heater not working?
First make sure the BH red power plug is in the BH, then do a continuity test with a meter on the main plug wires at the grill. If there is no continuity check the wires for breaks just behind the 120V plug. Pull on the wires and you can see the break as the shielding gets smaller, cut off the end. If the 2 power wires now have continuity through the BH just replace the 3 prong plug.
Are you aware of the block heater cracking the block on some 85 6.9 engines, what is the serial number of yours......
According to one update: I have the updated casting was implemented starting with block number 173828 (which translates to roughly halfway through the '85 model year).
The other is:
6.9 blocks up to serial #u2u17900 had a thinner casting around the block heater. It is very common for these blocks to crack.
93 F250 7.3 IDI S/C XLT 4X4 E40D 3.55LS, Captains chairs, Tutone Mocha, Leer 48" Hiboy cap, FR & RR hitches, full DeeZee running boards. Factory ordered/delivered Jan 93
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