DEI 451m relay question

I am installing a clifford matrix rs 3.5 in my 87 300E benz and need some advice about the 451m relay pack that is included with alarm system.

The back of the 451M relay says: 3pin plug- green (-) lock input, red (+)pos input for coils, blue (-) unlock input. I know where this plug goes.

The 5 wire harness is labeled:

purp/bk lock/unlock normally open #87

grn/bk   lock output#30

wht/bk   lock normally closed #87a

blue/bk  unlock output #30

BROWN / bk unlock normally closed #87a

 Here is what someone else told me to do, but why does the purp/bk have an inline fuse? And there is a purp wire coming out of relay that joins the purp/bk at the in line fuse :

GREEN/ black and BROWN / black are tied together(lock relay 30, unlock relay 87a)

WHITE/ black goes to the switch side(lock relay 87a)

blue/black goes to the motor side(unlock relay 30)

purple goes to 12v(unlock relay 87)

PURPLE / black goes to ground(lock relay 87)

So, if the PURPLE / back is to go to ground, why does it have an inline 15amp fuse?

TIA for any help

The violet and the violet/black both exit the relay seperately then are connected into an inline fuse together before/at the fuse. So you are saying to cut the violet away from the violet/black, and hook the violet/black to ground? And the violet to 12v. Right? The small red wire of the 3 prong plug says 12v+ input for relay coils as well. 

 I just want to make sure before I cut. I understand how to connect it to the pump system.

Thanks for confirming and helping me understand this. I am a DIY'er and will be looking for some install books to read so I can better understand.

Best!

Can someone help me. I too have an 87 300E and I also used a 451M relay but I have mine hooked up with a Rattler 369D. However I do not believe that the 369D can be set to have a longer than 1 second pulse to unlock the doors. This results in the vacuum pump activitating to lock the doors for 1 second and then all of a sudden it unlocks the doors. I heard that if the 369D does not have a 3sec or longer door pulse than I can get a timer. I was looking at the DEI 528T but I'm not sure exactly what I'm supposed to do with the timer.

Thanks

I don't know about the rattler alarm, but wanted to let everyone know that the install was a success!

I am very satisfied with the Clifford Matrix RS3.5