Question about Cars & Trucks
With key off, fuse blows immediatly when inserted.how can I test this relay(MBz#201 3745
Posted by Anonymous on
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Posted on Jan 02, 2017
if you replaced fuel pump i would look at backward wiring when replaced and i would start at the source of work if your vehicle was working fine before replacement then 9 out of 10 it will be your fuel pump wireing
sometimes when putting wireing back together the connectors have the missing clip and in turn you can turn the wireing in both directions now where positive is touching the ground on both sides of connector kris kross problem check your work this is crucial use a test light to find the right wires where they go
Posted on May 26, 2008
I can't locate the under dash fuse block on my 92 cad sts. Help please. The AC/Heat blower will not come on, I think I have a blown fuse.
Posted on Jun 12, 2009
The fuse it doing it's job, you have a short ( Wire that is connected to a ground, that draws too much power )
If you have an electrical schematic ( Repair manual ) find out which wires are connected to that fuse and check them for any chaffing, cuts, unnesassary twists, or corrosion.
If you have a ohm-meter, isolate the system ( by disconnecting the fuse, and other connections. Then check for any resistance on wires that should not be connected ( because you disconnected them ) by having one Lead on the wire's connector and the other meter-lead on your car's frame. A good wire will not have continuity if it is isolated.
Posted on Apr 10, 2010
There is a short circuit to ground. I am constantly preaching that it does absolutely no good to replace a blown fuse until the cause of the blown fuse is found. Fuses do not blow for no reason. If you have a blown fuse it means that you have a circuit overload that could potentially burn you truck to the ground. Simply replacing the fuse will only cause another fuse to give up its life to save your truck from roasting. On pickup trucks with trailer hitches, the first place I look for a problem with tail lights is in the trailer wiring harness. They are usually not installed properly. I have seen several of the plug-in type trailer harnesses (the kind that simply plugs in at the connector between the body harness and the bed harness) short internally. You can usually fix the tail lights by simply disconnecting the trailer harness and plugging the body harness back into the bed harness.
If this does not fix the problem, the tail light circuits will have to be traced from the fuse all the way back to the lights to find out where the short is.
Posted on Dec 19, 2010
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